Fixed the second half of bug 302758

This patch almost rewrites the KisInputManager to fix the mentioned
bug. Now all the state transitions of the actions are controlled by
a special class KisShorcutMatcher. This class is easily controlled by
a separate unittest. The work of the actions is now can be represented
by a simple state machine with three states (see docs for class
KisStrokeShortcut).

CCBUG:302758