Cleanup
Cleanup
Added time since last game tick lookup
Removed tick time tracking
Clarified elapsed time since last tick method name.
Fixed non-updated tick time bug.
Added time-insensitive behavior
Added time-insensitive behavior
Finished implementation
Added value boundaries
Added auto-leveling behavior
Added propulsion behavior
Added throttle behavior (pgup/pugdown) for user-controlled objects
Implemented newly-created behaviors.