A TODO added.
Adding the first version of the Orbit mode.
Displaying yaw, pitch and roll.
Cosmetic changes.
Removing obsolete method.
Updating axes and view direction in Orbit mode.
Updating yaw and pitch in FirstPerson modes.
Small refactoring.
More friendly Orbit mode navigation.
Moving camera in the Orbit mode.
Removing some hardcoded values.
Removing obsolete TODO.