Refactor movers in ecs

Everything should be fixed. Test passed and Sigma runs normally, at least with GCC.

Please build the tests and run them. They are pretty exhaustive to detect bugs.

The headlamp has disappeared but it is normal: its transformation matrix is not updated correctly since I change the way BulletMover matrix is updated. I did not dig into OpenGLsystem intentionally to avoid a lot of conflicts with current works.