Added AStar tracking with enemies

-draws path
-when enemies finish path they directly follow the player until a new
path is found
- The bigger the enemy the less likely the enemies would create a path
close to wall *still buggy
- If nodes are in a specific range of the goal node they snap towards
the goal (even if nodes have high f_score!).
- Enemies when killed always leave behnd a follower and has a fifty
percent chance of spawning another one