First commit of the new pathfinding API.
Moved raycast collision detection to the common package
com.badlogic.gdx.ai.utils
Fields are now protected.
Minor changes.
Added default graph path implementation.
Added some javadocs.
Made GraphPath Iterable to support the "foreach" statement.
Added hierarchical pathfinding.
Fixed and improved hierarchical pathfinding.
Added hierarchical pathfinding test.
Added metrics to the hierarchical pathfinding test.
Very small changes :)