Improve Qt AS module and tool descriptions on Overview page

Clarified the description of some Qt Automotive Suite tools and
and related modules. Added also a high-level picture of Qt AS
structure. The picture is based on the blog post written by
Alistair Adams in June 8th, 2016. The picture is updated
according to Qt brand guidelines (font, colors).

Task-number: QTAUTO-558
Change-Id: If5828fe307a1f99cb8c29d36a6e18805015fbe42
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

3 files changed, 59 insertions, 27 deletions

diff --git a/src/doc/qtautomotivesuite/src/external-resources.qdoc b/src/doc/qtautomotivesuite/src/external-resources.qdoc
index 9b9b708..48fada7 100644
--- a/src/doc/qtautomotivesuite/src/external-resources.qdoc
+++ b/src/doc/qtautomotivesuite/src/external-resources.qdoc
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the documentation of the Qt Automotive Suite.
@@ -31,6 +31,11 @@
 */
 
 /*!
+    \externalpage http://doc.qt.io/
+    \title Qt Reference Documentation
+*/
+
+/*!
     \externalpage https://doc.qt.io/QtQuickCompiler
     \title Qt Quick Compiler
 */
@@ -174,3 +179,13 @@
     \externalpage http://www.nvidia.com/object/drive-cx-request.html
     \title NVIDIA DRIVE™ CX
 */
+
+/*!
+    \externalpage http://doc.qt.io/emulator/
+    \title Emulator
+*/
+
+/*!
+    \externalpage http://doc.qt.io/qtcreator/creator-overview-qtasam.html
+    \title Qt Creator Application Manager Plugin
+*/
diff --git a/src/doc/qtautomotivesuite/src/images/qtas-architecture.png b/src/doc/qtautomotivesuite/src/images/qtas-architecture.png
new file mode 100644
index 0000000..ab967fd
--- /dev/null
+++ b/src/doc/qtautomotivesuite/src/images/qtas-architecture.png
diff --git a/src/doc/qtautomotivesuite/src/qtautomotivesuite.qdoc b/src/doc/qtautomotivesuite/src/qtautomotivesuite.qdoc
index 4d7a0b9..6d55b26 100644
--- a/src/doc/qtautomotivesuite/src/qtautomotivesuite.qdoc
+++ b/src/doc/qtautomotivesuite/src/qtautomotivesuite.qdoc
@@ -75,16 +75,24 @@
     \previouspage {Qt Automotive Suite}
     \nextpage {Installing Qt Automotive Suite}
 
-    \section1 Components
-
     \QAS includes several components built on Qt and the \l {Qt Creator}
-    integrated development environment.
+    integrated development environment. The following picture illustrates
+    the structure and environment of \QAS. The parts outlined in grey are
+    specific to \QAS:
+
+    \image qtas-architecture.png
 
-    \section2 Qt
+    \section1 Qt and Qt for Device Creation
 
-    Cross-platform \l {http://www.qt.io/}{Qt} development libraries (Qt 5.7)
-    and core tools, developed through an open-source collaboration model.
-    Qt is a full development framework designed to streamline the creation of
+    \QAS is built on top of the \l {Qt for Device Creation} offering.
+    In addition to Qt, Qt for Device Creation contains an embedded development
+    environment built around Qt Creator. Especially, Qt for Device Creation provides
+    Boot to Qt, a light-weight software stack for embedded systems. It supports
+    building your own Linux image for customizing the Boot to Qt stack.
+
+    Qt is a cross-platform \l {http://www.qt.io/}{Qt} development framework
+    that provides libraries and core tools, developed through an open-source
+    collaboration model. Qt is designed to streamline the creation of
     applications and user interfaces for desktop, embedded, and mobile
     platforms.
 
@@ -94,9 +102,9 @@
     \l {Qt Quick} or HTML5/hybrid user interfaces with the \l {Qt WebEngine}
     module.
 
-    For overview about Qt libraries see the \l {Qt reference documentation}.
+    For an overview of Qt libraries, see the \l {Qt Reference Documentation}.
 
-    Qt modules that are especially useful for embedded/IVI application
+    Qt modules that are especially useful for embedded and IVI application
     development include:
 
     \list
@@ -111,9 +119,11 @@
             \l {http://www.chromium.org}{Chromium} project.
     \endlist
 
-    \section2 Development Environment
+    \section1 Development Environment
 
     The development environment in \QAS is built around \l {Qt Creator}.
+    The following topics provide more information about Qt Creator as a
+    development environment:
 
     \list
       \li \l {Qt Creator: Developing Qt Quick Applications}
@@ -124,52 +134,59 @@
     \QAS comes with additional functionality for diagnostics and debugging,
     as well as deployment:
 
-    \section3 GammaRay
+    \section2 GammaRay
 
     GammaRay is a plugin for Qt Creator that provides software introspection
     for Qt applications. It allows visualization of application behavior and
     manipulating it at run-time, both locally and remotely on an embedded
     target.
 
-    \section3 QmlLive
+    \section2 QmlLive
 
     \l{Qt QmlLive}{QmlLive} provides a live reloader environment for rapid development of
     Qt Quick applications, dramatically reducing the time it takes to
     deploy and test changes in the UI design.
 
-    \section3 Deployment
+    \section2 Deployment
 
     Device deployment can be done directly from the Qt Creator IDE to a
-    device connected via USB or local area network, or to an emulator
+    device connected via USB or local area network, or to an \l{Emulator}{emulator}
     running the same, full software stack as the devices.
 
     As with any Qt application, the same project can be deployed to
-    desktop or mobile targets as well.
+    desktop or target devices as well.
 
-    \section2 Automotive APIs
+    \section1 Automotive APIs
 
     The \l {Qt IVI} module provides C++ and QML interfaces for accessing
     vehicle features, and also enables implementing new IVI features.
     Already defined interfaces from the GENIVI alliance are exposed in the
     \l {Qt GENIVI Extras} module.
 
-    \section2 Qt Application Manager
+    \section1 Qt Application Manager
+
+    \l {Qt Application Manager} provides a basis for a multi-application
+    embedded system. It takes care of the application lifecycle management.
+    Qt Application Manager provides an API for implementing a UI and its application
+    logic separately.
 
-    \l {Qt Application Manager} provides application lifecycle management.
+    Qt Creator contains a
+    \l{Qt Creator Application Manager Plugin}{Qt Application Manager} plugin
+    that facilitates the development of 3rd party applications within
+    a Qt Application Manager setup by automating the underlying processes.
 
-    \section2 Reference Applications
+    \section1 Reference Applications
 
-    \QAS includes \l{Neptune UI}{Neptune}, a reference HMI designed for IVI
-    systems, including multiple IVI applications and an application store
-    implementation. It enables the OEMs to test their applications on supported
-    hardware and emulator targets.
+    \QAS includes \l{Neptune UI} that provides a UI implementation for
+    Qt in IVI (In-Vehichle Infotainment) systems. It demonstrates best practices
+    for developing an automotive UI with \QAS.
 
-    \section3 Web Browser
+    \section1 Web Browser
 
-    \l {Qt Web Browser} is a browser designed for embedded devices, based on
+    \l {Qt Web Browser} is a browser designed for embedded devices. It is based on
     \l {Qt WebEngine}, with a slick, touch-friendly user interface.
 
-    \section2 Over-The-Air Updates
+    \section1 Over-The-Air Updates
 
     \QAS comes with \l {Over-The-Air Update}{Over-The-Air} (OTA) package, providing
     tools that assist in enabling distribution of software updates in embedded