com 6 to heroeschessgui

big improvement. most of the animation implemented, apart from attack
anim which still doesn't show properly. tried using new
PieceGui(<attacking guiPiece>) but it's not working apparently.
testing for check now has top priority, since game doesn't allow any
pieces, including the king, to move in check. also, the way the game
loads all animation gfx into a "buffer" hashmap, and takes from this
hashmap when creating 64-array of game pieces, needs improvement. now
the gfx is loaded into buffer by way of PieceGui object creation, but
possibly a better solution is somehow only loading in the raw gfx
without making PieceGui instances.