Fixed distance field text getting clipped at small sizes.

Task-number: QTBUG-32750
Change-Id: I6bdf63d3cbcaaeb54c7c1ae25dfc55fc7e964075
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Remove comment that QQuickPaintedItem is only useful for porting.

Change-Id: I5d4a7917baa7c8f8dd7cfe3f49c6cf4fe5532ac0
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>