More Ai weapon decision-making functions

Completely reformatted the AIControl.cs weapons. Hesp will now only fire
EpicScream, which inverts steering, if one or more players are on a
straightaway with no walls where it is likely they might fall off the
track.  TRex saves his melee, FlameThrower, for any player dino. If an
Ai dino gets hit by the FlameThrower they will use a Health pack to
counteract the dot effects, if they have a health pack.
AIStraightTrigger.cs now detects if player dinos, not just Ai dinos, are
on the bridge straightaway. MUCH MORE TO COME.