Listenery
-Added - Combined listener to compensate executing more actions  on performing specific action (mouse,key). Could be replaced with adding more actions to xml (more action tags).
-Added - Data listener to define own variables and using it inside game, or in other actions.
-Added - VAR command inside listener class (in addition to LIST). This one will return value of a defined variable.
-Bugfix - GamePane wasn't properly repainted after loading save (because of not defined screenImage/bufferedImage ). Moved method setWidthAndHeight, that is responsible for creating bufferedImage, inside load and create map methods.