Loop for each piece which cross every line
Added cutter. Removed GamePiece list. Still not removing
Polygon added area method
Maybe completed cutter from JS. TEST
Implemented game cutting logic

Many changes
Fix isvec4ordered & comment isvec4*

TODO: avoid two isvec4* functions. They probably can be merged
Changed printing style of polygon to JSON array
Fix two bugs in cutter
Added license header to cutter.h
Merged vec4 sorting detection functions
Added polygon.array_rotate method for testing
Added test directory: testcutter
Updated TODO
Preliminary number display (for score)
Merge branch 'master' into cutting
Workaround for duetto std::set bug
Implement scoring
max speed parametric to level
Changed game background for cutting
Implemented gameover falling