Ray queries... sounds more exciting than it is

Been working on ray queries to give entities some way to tell what's near them. Bit trickier than I was hoping as the built in ogre methods haven't been implemented in the Polyvox Scene Manager. I don't think I have time within this part of the project to mess around in the scene manager to implement it so I'm going to have to hack one on top. I think I can get it pretty efficient, and I can still use the ogre methods to get fellow entities; the trick is going to be getting it to use both together efficiently.