Expose PdfBookmarkModel to QML; use with TreeView in manual test

- TreeViewDelegate uses Qt::DisplayRole by default, so we need it to map
  to the text we want to display, in the roleNames() hash. But asking
  explicitly for the TitleRole is OK too (as before).
- In QML, the document property must be a QQuickPdfDocument, whereas in
  C++ QPdfDocument is used directly; so we shadow the document property
  for QML.  Therefore QML_EXTENDED(QPdfBookmarkModel) does not work: we
  need real inheritance to get real property shadowing.
- Added tests/manual/quick/pdf/bookmarks.qml with a TreeView
- Clicking the TreeViewDelegate expands the subtree if there is one; but
  it also goes to the destination in the PDF, whether there is a subtree
  or not. But this can be fixed in TreeViewDelegate.
- Added tests/manual/quick/pdf/bookmarks-list.qml to test the case with
  structureMode: PdfBookmarkModel.ListMode (using ListView)

test.pdf is uninteresting for this purpose: there is only one bookmark;
but you can run these tests with an optional argument like this:

qml bookmarks.qml -style Material -- ~/path/to/some.pdf
qml bookmarks-list.qml -- ~/path/to/some.pdf

Change-Id: I65d12a3d9b8ef0f0fa2bc99003430324fd759dcb
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

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