Got path-finding implemented

I imported Aron Granberg's excellent A* Pathfinding Project and got the dinos using it for homing and attacking behavior. This helps a lot with dinos getting stuck on corners and makes them attack a little more persistently. Give this a whirl!

Changes:

• A* path finding for dinos
• Camera follow script no longer goes off-map
• Fixed a graphical layering issue that made the animated tide go under deep water
• Added a time delay to the t-rex shooting