Implemented Formatable Text, Implemented custom cursor

-Implemented event for changing display-attr of mouse-cursor
-Added event-listener and variables for reading the mouse position
-Implemented Formatable Text object (...and that wasn't funny)
-Fixed a bug at "remove_all_events" function: events will no longer stay
alive if the scene was changed and there is another event with the same
trigger
-Improved the load-save function: Its now possible to load any kind of
image r.g. "CGE_Sprite", "CGE_Text" (instead of only "CGE_Image"
objects)