Implemented air control.

Needs tweaking.
Air control messing up fall speed fixed.

We still lose some velocity if we stop steering in air which needs to be fixed.
Merge remote-tracking branch 'origin/master' into Air_control
Small fix.
Merge remote-tracking branch 'origin/master' into Air_control

Conflicts:
	Physics/Source/Physics.cpp
Merge remote-tracking branch 'origin/master' into Air_control