Fix to Raytracing.

Not calculatable sprites are now correctly analyzed as visible.
Fix: Blocks which are hiding past blocks are not identified correctly
Explosive Barrel refactoring
Added Light Engine V0.1

The brightening of blocks is broken.
small refactoring
updated to make compatible to newer slick version
Reversed the scaling at the end of engien rendering
Minimap resolution fix
Included LightEngine V0.1.1
Improved rendering with lightlevels
Small fix
New unlit sprites

I need to replace the old ones with new unlit sprites for the new light
engine.
New coordinate class

Chunkswitch and character walking broken.
Improved LightEngine
small refactoring
Changed world-spin direction.
Improved map
improved & fixed entity positioning
Added "smooth breaks" to characters.
Fixed jumping on highest level