Added header for isValidMove function
Merge branch 'master' of github.com:Heavenrich/ChessNut

Conflicts:
	libraries/Chess/Chess.h
pawn move validator
added move checking for every piece; TODO check, checkmate, enpassant, castling
Merge branch 'master' of github.com:Heavenrich/ChessNut

Conflicts:
	libraries/Chess/Chess.cpp