Added better debug routines

Also, fixed the worst of the control problems. Still spins on the spot,
can better debug this now though!
Continued control/state work

Fixed turning controls, this works now. Added forward movement; works,
but doesn't fall. Need to add gravity behaviour, remove gravity from
jump routine.
Gravity system

Objects can now have the state "heavy", and the state "gravity".
function "heavy" pulls object down, and will remove "gJump" if present.
(Maybe swap out for "landed" function to reset gravity and remove all
such functions?)