Added pathfinding libraries
Added States and Pathfinding
Added Recast-Library for Pathfinding
Fixed pathfinding libraries + added *.sdf to .gitignore
Removed library, because it wasn't possible to compile when the library is included in irrlicht
Added comments
Small fix in object detection method
Merge branch 'artificial-intelligence'

Conflicts:
	source/Irrlicht/Irrlicht10.0.vcxproj.filters