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

Instead of using the pre-processed source, the original one is used.
This makes a difference when a macro is used in the line, where the pre-
processed source would have a "#gen true" token.

Task-number: QTCREATORBUG-3345

Reviewed-by: hjk

Also introduce a indirection, modes have now types, edit and debug have
the same type, and editors do have a prefered type of modes instead of a
prefered mode.

That fixes the bug that if the prefered qml editing mode was set to
design, then in switching between qml editors would
- in Edit Mode: stay in edit mode
- in Debug Mode: switch to debug mode

Task-number: QTCREATORBUG-2300

Required refactoring of the search result window to show real trees of
search results.

The backend is the backend from the Locator filter, which is a bit
outdated now.

Reviewed-by: Roberto Raggi

OK, it seems that this change is not necessary.

This reverts commit 40bae63c.

Done-with: Erik Verbruggen

Done-with: Roberto Raggi

Fixed crash in FindUsages on a dirty file in a large project, which is saved
while the FindUsages is still running.

Reviewed-by: Erik Verbruggen

This uses the same UI as "Rename Symbol".
Moves the actual rename implementation to a static method in
BaseFileFind and uses it for rename symbol and search & replace.
Moves the signal notification for the code model from VCSManager to
the more general FileManager.
Note that as for rename symbol, there's no undo yet.

Task-number: QTCREATORBUG-73

Encapsulate the details.