Transform tool was the last tool not ported and filtering events directly.
Now it also uses the predefined actions. The resulting architecture doesn't
seem to be ideal, and looks a bit complicated with lots of methods calling
each other and forwarding 9 methods for every strategy. Probably, we should
use some boost::function-based action assignment here. Then we will be able
to map/remaps actions quite easily.

This patch implements shift-gesture action and ctrl-base inversion for the
transformation tool. Right not it is almost ready for usage. The only thing
left is "build-up vs wash mode" switch (if needed) and better UI.

CCMAIL:kimageshop@kde.org