Added special mode in scene for bots to build more buildings than they usualy can

Will be used in "Leaving Earth" missions for making decorative bots building base
Added fall damage

+ changed window title
Fixed bug from a61da7404bf8430132864d493c7e75a6b4c3d978

Moved ExploObject to CPhysics::EventFrame, it shouldn't crash anymore.
Merge branch 'dev' into dev-ui
CScreen
Main menu test button