Give OgreOggListener its own Movable Object Type name

[chillywillysoft]

OgreOggListener's override of MovableObject::getMovableType() returns the same name as OgreOggISound. One of the main reasons for getting the type is to be able to cast the pointer to a pointer to a specific derived class, which this shared name prevents. A current workaround is to compare the pointer to the singleton's listener:

	for (Ogre::MovableObject * mo : sn->getAttachedObjects())
	{
		if ((mo->getMovableType() == OgreOggSound::OgreOggSoundFactory::FACTORY_TYPE_NAME) &&
			(mo != OgreOggSound::OgreOggSoundManager::getSingleton().getListener()))
		{
			OgreOggSound::OgreOggISound * sound = static_cast<OgreOggSound::OgreOggISound *>(mo);
		}
	}

This PR gives the Listener its own name. It also changes the constants' names to the new MOT_* style. It breaks existing code so I understand if you don't want to merge this one.