Implemented Change Scene, Fixed many Load-Save-bugs

-Implemented input controller refresh (at scene and map change)
-Changed Player-Move events to parallel processing
-Implemented change scene logic and event
-Fixed some bugs that occured when loaded a save file which was not on
the Map-Scene
-Added loading of events and images from outside the map_data object
when save file was loaded
-Fixed a bug at save-loading: events will no longer be loaded twice