- removed obsolete method isOccupied from IBuilding 
- removed obsolete method isOccupied from IBuilding 

JKatzwinkel/settlers-remake,jsettlers/settlers-remake,phirschbeck/settlers-remake,andreas-eberle/settlers-remake,andreas-eberle/settlers-remake,andreasb242/settlers-remake,phirschbeck/settlers-remake,andreasb242/settlers-remake,jsettlers/settlers-remake,phirschbeck/settlers-remake,andreasb242/settlers-remake,jsettlers/settlers-remake,Peter-Maximilian/settlers-remake,andreas-eberle/settlers-remake