Scene; Entity filtering for scene

[whuop]

Would be a nice addition for the luxe scene to have entity filtering. So that a certain group of entities could be fetched from the scene, instead of iterating through all entities or just fetching separate entities by name.

[ruby0x1]

This has started working it's way into the repo here for reference : https://github.com/underscorediscovery/luxe/commit/bda9c1fe342766703986333dbf88fa802121fbd3