Ported the Transform Tool onto primary/secondary actions framework

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