Blender Git Loki

WIP: Packing computation

Refactored code, bugfixes and cleanup: Moved area sorting outside NFP computation so it's only done once, actually assign area to charts, deleted commented out code
Use random NFP for placements, still misses checks for being inside IFP or other NFPs

While NFP computation works, there's still a bug with reference vert offset of NFP which causes incorrect placement