The snippets page should not operate on the font settings
changed signal when the ui does not exist.

Task-number: QTCREATORBUG-5173
Change-Id: Ic1363cb41340b5ea04803eb27de3dd0af6ecda0c
Reviewed-on: http://codereview.qt.nokia.com/511


Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

Task-number: QTCREATORBUG-5007

Change-Id: Ied78ef17ea7a25d22c37d36fd4eb7257c6c9f4c0
Reviewed-on: http://codereview.qt.nokia.com/293


Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

lots of use of Utils::FileSaver and Utils::FileReader

Task-number: QTCREATORBUG-1619

rename BastTextEditor->BaseTextEditorWidget, BaseTextEditorEditable->BaseTextEditor
rename BaseTextEditor{,Widget} subclasses
rename editableInterface->editorInterface
rename createEditableInterface->createEditor
minor cleanups after renamings

Cannot rely on the focus out event (on Mac) in the
situation where a snippet is added/edited and the
dialog is immediately confirmed.

Reviewed-by: con
Task-number: QTCREATORBUG-3464

Reviewed-by: hjk

Let the collection itself be the singleton.

Groups are no longer enum values but identified from snippet providers.

- Restored removed built-in snippets.
- Revert a built-in snippet.
- Reset the snippets collection.

Reloading and synchronizing are now directly accessible from
the collection interface.

Provide an interface so users can create/edit/remove snippets.