Added fBoxCollider2D component class
Added fPhysicsWorld class
Fixed and solve changes in fTypedGroup class
fGroup now is a fTypedGroup of fActor class. Remove fGroup.cpp
Remove overcall of contructor of fSprite
add fBoxCollider2D component in fSprite constructor. add draw() and update() of fBoxCollider2D component in draw() and update() of fSprite class