Remove QQuickItem/PaintedItem wrappers

They were used to hide the differences between QQuick* items and
QDeclarative items when we supported Qt4 and 5.

Now that we've dropped Qt4 support, we don't need theese wrappers
anymore.
updated angrymemes example
make the angrymemes example more dynamic
Better reuse of code in the angrymemes example
Added TrollFace for angrymemes