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[Common::Utility::Camera]
* Added a copy constructor which only copies the orientation and position of
  the camera, not taking along the projection or view
* Added an assignment operator, which, like the copy contructor, only copies
  the orientation and postion of the camera being duplicated
* SetOrientation takes in a Quaternion representing the orientation of the
  camera and sets the current camera's orientation accordingly
* GetOrientation returns the orientation of the current camera as a Quaternion
[Common::Utility::FreeCamera]
* Removed redundant member functions and variables
* The orbit was not necessary when the new calculation of the orientation was
  implemented
* The Euler-based Rotate is largely useless as it's just simpler to represent
  the change in orientation as an angle-axis pair