numerous bugfixes in pathfinder + multi level mazes
moving minions in a huge multilevel maze
Reverted Chunk.java
Adds some minor cleanups and fixes.

* Fixes that some rendered elements were not lit correctly in certain scenarios (e.g. item meshes did not use the light values at the current position of the mesh but at the position of the player)
* Cleans up the code style in the crafting module
* Adds some specialized shader program instances to the rendering part of the crafting module
* Adds a separate shader program instance for each font
Adjusts HDR exposure bias (reduces overall brightness in the scene a tad).
Adjusts HDR target luminance value.
Merge PR #639 from @synopia - pathfinding updates and L&S models
Fixes #641.
Fixes that the default config file did not match the actual video settings on "Nice".