Now oriented to Top.

Now, only one instance per scene is allowed in calling UBGraphicsCache instance() static function.

Angles are now copied when saving tool state.

Triangle: Resizing of the tool is broken

TODO:
 * nice icon
 * nice brush
 * fix draw with marker

Now coping creates a full copy of already created item. Copy has it's own content (like video, audio or folder) and stores original item properties (like locked, pos, size, freezed e.t.c.).

SANKORE-774 - toolbar disabled for all items instead media and text items. It allows to calculate items bounding rect correctly.