Added ball, static for now.
Added simple collision detection and simple game box.
Added YOBA rotation support. Not working properly
Now object coordinates doesn't depend on graphical coordinates (bonds
reversed)
Implementations moved from header to cpp
Added new version of collision resolving, still glitchy.
Added object position correction after impulse resolution and ball speed
stabilization after speed boost.
Added angular speed to rigid body interface. Used it to manage angle of
platform but no real need in it for now.
Fixed added untracked external lib files
Merge commit '89af53f'