Some minor cleanups
Move Y from magic numbers to Side/Outcome.
Move Pentago from magic numbers to Side/Outcome.
Move Hex from magic numbers to Side/Outcome.
Rename the main files from castro,moy,pentagod,etc to main.cpp so they're easier to compare.
Remove the old player/solver code that hasn't been used in a while.
Improve the dists output in havannah and y, enable the zobrist command in y and hex.