Added a missing header in DynamicBatch.
The const version of Value::getArray break the const-ness, but we should be able to hide the change in and give the impression that the object is still const in the future.
Change the default matrix in ResourceManager::loadFlashExporterSymbols to an identity matrix instead of {0,0,0,0,0,0}
Overloaded the extract step for rapidxml.desc