Unlinker: Make zone files creators game dependent and in the unlinker project instead of the ObjWriting component

src/ObjWriting/Game/T6/ZoneDumperT6.cpp

@@ -78,9 +78,4 @@ bool ZoneDumperT6::DumpZone(Zone* zone, const std::string& basePath) const
     return true;
 
 #undef DUMP_ASSET_POOL
-}
-
-bool ZoneDumperT6::WriteZoneDefinition(Zone* zone, FileAPI::File* file) const
-{
-    return true;
 }