A Rubik’s cube optimal solver

Work in progress, need to clean up and fix.

This is an optimal solver only, for other versions see nissy.

TODO: document things that have been lost in the split to nissy-classic.

• Coordinates
• Symcoordinates (new stuff!)
• Pruning tables (maybe not necessary)
• Coordinate solving
• fst cube
• Is it worth saving optimal solver stuff (threader…)?

Where to collect random information like this table?

Table ptnxopt31HTM Base value: 9 0 1 1 6 2 29 3 164 4 1433 5 16772 6 205033 7 2513871 8 30329976 9 342440769 10 2815191126 11 6147967200 12 524918774 13 3546 14 0 15 0