Removed Crap code from PhysicsEngine and removed some stuff

* Heap Corruption when deleting physical mesh from the player.
Reason why is till unknown

* The instance of an object is being removed when removing PhysicsObject in the destructor. This means it will recreate the mesh every time its is created.

* Sometimes the player disconnects when it connects instantly.
  This generated a crash on the server because the channel was not allocated. The crash is gone, but it's still a problem that needs to be solved, because player data will not be deleted.

* Removed old code from PhysicalEngine that we no longer need.