navigation update

General:

• Changed the way that enemies navigate to the exit. Enemies are a bit less smart now, but this allows for less lag when computing the path.
• In the future I might add turrets that spawn units that travel up the path, but maybe later.
• There will be no more enemies stuttering when they try to turn, especially the faster ones.
• The tooltip has been disabled while I investigate a bug
• Since enemies will no longer stutter, the fast forward now has a 3x speed. This means it has a 1x, 2x, and 3x speed.
• Now that I have control over the speed of enemies, I have made it so that the speed = the number of squares it will travel to per second.
• There may be a bug with shielded enemies and the speed not being set properly when the shield falls. If that is the case, it is only better for you.