Fixed some minor compiler warnings
Laid the framework for events

Added a keyboard event system for keyboard input.

Created a event handler for the GLSixDOFView. This event handler is a
controller as it controls the camera movement through calls to
OpenGLSystem.
Added keyboard event system and static delta time to IOpSys

IOpSys now has a static member that stores the current delta time. This
is accessible in any part of the code by including IOpSys.h.

Also IOpSys now has a keyboard event system. This is used by the various
OpSyss for keyboard events.
Implemented the camera controller

The camera controller is now implemented. The current method though is
lacking in smooth movement, and is borked when pressing a second key.
The behavior is correct and not a bug. What is needed is a physics
system to apply a movement on update and the event system will then need
to add or remove a constant force instead of adding a constant movement
each event.