The smart backspace handling required a preceeding
non empty text block. In this case, the fix introduces
a standard backspace (deletePreviousCharacter).

Reviewed-by: dt

Streamline code, avoid functions and container.end() invocations,
introduce private, reduce #ifdefs, clarify code and add
comments about usage on various platforms.
Implement QFileIconProvider interface, making it usable for file system
models. Use in FolderNavigationWidget. On this occasion, add checkable
"Synchronize" action to FolderNavigationWidget.
Task-number: QTCREATORBUG-62

Just use high level TextEditor::gotoLine instead of directly manipulating
the QTextCursor.

Task-number: BAUHAUS-326

Checking for undefined and null everywhere is the only way to fix this
right now

QmlStringConverters has been cleaned up

Such that the layout of the left hand sidebar can be restored
even if the display language is changed.

I polished and refactored most of the property editor (again)
I introduced more custom widgets with expression editing, fixed bugs
and polished the visual design

Done with: Erik

Done with: Erik

Done-with: Roberto Raggi

Give dialogs a consistent look, set
WA_DeleteOnClose on them and improve updating.
Add a Refresh/Diff buttons to branch dialog.

Done-with: Roberto Raggi

Do not include the old description - this looks strange in some cases