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

src/ObjWriting/ObjWriting.cpp

@@ -26,9 +26,4 @@ bool ObjWriting::DumpZone(Zone* zone, const std::string& basePath)
     }
 
     return false;
-}
-
-bool ObjWriting::WriteZoneDefinition(Zone* zone, FileAPI::File* file)
-{
-    return file->Printf("// %s", "Insert zone definition here") > 0;
 }