Ui text: port widget to new interfaces

This is a big rewrite. In addition to implementing functionality with
the new Efl interfaces, a lot of legacy (Elm) code was removed.

A lot of work is squashed in this patch as the widget would've been
completely broken otherwise.

The major changes are:

Life-cycle:
  - Code was split to have 'finalize'
  - Item anchors (emoticons, images) were rewritten to have proper
  life-cycle

Scrolling logic:
  - Efl.Ui.Internal_Text_Scroller widget was added, and replaces the old
  Elm.Interface_Scrollable implementation. Singe-line and multi-line
  modes were fixed as well as sizing calculations. The object is now
  swallowed inside the Ui.Text widget.

Copy and paste:
  - Code was converted to Efl.Selection logic.

Modified tests:
    elementary_test -to "efl.ui.text"
    elementary_test -to "efl.ui.text label"

Added tests:
    elementary_test -to "efl.ui.text inputfield"

Removed test:
    elementary_test -to "efl.ui.text.async"

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