made Actor trait

created default draw function for Actor
made exit GleanyGame.exit()
added Enemy, fixed Corridor

removed redundancy in Corridor, this fixed discrepancies between
collision map and graphical representation and makes future changes
easier
created Enemy class
added justMoved field to Player so one can check for it and then update
the game
added enemy creation to RoguelikeMode creation, to be moved to Floor
creation probably
added long() to Rand