changed gamemap to interface, added arraygamemap and gamemapobject
Minor refactoring of names
Added enums for gamemapobject
defined constructors and added enums to gamemapobject
moved Action.java to backend package
renamed gamemapobject to gamemapentry
added set to interface and defaultgamemapobject to arraygamemap
changed gamemapentry members to private and added accessor methods
added frontend/backend import statements to appropriate packages