* Remove the scene size factor from the UI (it's now hardcoded to 2.5, and will be completely removed later).
* Allow to deactivate the scene size constraint which is represented by the greyed-out areas. In fact, it's off by default.
* The zoom widget has a new toolbutton for enabling and disabling the scene size constraint.

CCBUG: 211853

svn path=/trunk/playground/games/palapeli/; revision=1040612