First usable version.

Tons of improvements to AI and you can now do all chess movements. (Castling, promoting and doing en passants wasn't possible before)

v0.2.0

• Better sprites
• AI now uses improved evaluation function
• "Windows" features are now called "portable". (It searches in the relative path ./sprites/ instead of the absolute path used on install.sh.

Basic AI with just alpha-beta pruning and minimax

recursive dep. of 3, AI has only minimax and a-b pruning and UI is very rudimentary