New Display::Mode struct, a few new methods, and fixes. - Changed Display::Resolution to Display::Mode, with other signatures - Added Display::setMouseCursorVisible() method - Added some auxiliary methods to fgeal::Rectangle - Fixed transparency of newly created Image objects with SDL 2.0 adapter - Fixed "shaking" when drawing using drawScaledRegion() with SDL 1.2 adapter - Fixed backbuffer not being resized at display resize with Allegro 4 adapter - Some refactoring