disabled drops, changed ghost piece look, more

disabled drops temporarily, filled in the ghost piece, took away disp
"rotate" if rotating, lengthened waitLock, made half of the coming
pieces show while a message is being shown, made O tetrominos higher
when they're the coming piece, added score/coming pieces dividing line,
deleted unused comments, changed comments, added ClearScreen() after
pieceSetInto and PieceCreate.