fix a bug that could let the pacman go outside the lines if there was some lag
automatically generates the pacdots on the map
_generatePacdots now delete duplicates pacdots that were generated
add Map.getPacdot(index), Map.deletePacdot(index), Map.pacdotsCount(), and modify Pacman.move() so that pacman can now eat the pacdots
add a checkConfiguration() function