simple implementation of "pass"

still could use end-of-game checking
when updating the pieces on the screen use the middle of the piece location, not the upper corner
when drawing the piece list put the piece in the middle of the box
when switching pages remove the outline of the chosen piece
better logic for rotating pieces
Added colorful logo.
Multiple games can now be played
passing now uses the new method
passing is a duplicate of leaving
updated turn is sent
finished players are shown in bold