Improved testing
Fix: create line cutting remainders as OLD_PIECE

this will allow computing them in the following line cuttings
Implemented refining: cutter now has a tolerance
Fixes: avoid degenerate polygons
Stop every piece after cutting
Newly created piece has speed set to level max speed
Don't create piece if convexer returns empty
Higher walls
Fix for clang (duetto & emscripten)
Added next piece preview
Add testcase to testcutter
Implemented ENTER for pause
Implemented cutting pause and simple animation
Nextpiece display separate from PhysicHandler

Box2D rotates on the centroid. We need to rotate on 0,0
Remove ugly references from inputhandler & small fix
Simplified cutter interface
Fix for compilation bug (duetto)