Add Get Possible Moves Function For Bishop

Add in a function to get all of the possible moves for the bishop
because the user needs to see what move are available when the touch
the bishop on the screen.

Also, add in the rest of the cases in findMovesForChessPiece() that
will check all four corners of the chess piece for possible moves. In
order to get all possible moves for the bishop, queen, king and allow
the pawn to kill its opponents.
Add Get Possible Moves For Queen

Add in a function to get all of the possible moves for a queen because
ti is need to give the user options of what moves are there available.
Add All Possible Moves For Chess Piece King

Add function to get all possible moves for the chess piece king because
the user should be able to get the options of where to move the king
when they touch this chess piece.