Previously, when one pressed Ctrl+LMB in the default trigger
configuration, MovePiece would be triggered because LMB matches Ctrl+LMB.
This is clearly wrong, we want SelectPiece instead which matches
Ctrl+LMB exactly. So now, those interactors which have exactly matching
triggers are prioritized compared to those who do not match.

svn path=/trunk/KDE/kdegames/palapeli/; revision=1130156