Add positional predicates

[aksiome]

No description provided.

[SBtree-bit]

What exactly do you mean by this?

[theogiraudet]

This is why I always say to add description to issues ahah ^^'
I don't remember if we had several ideas, but I remember we wanted to add a feature to detect if an entity is outside or not.
This should be easy with the predicates.

[aksiome]

Yeah my bad, im just lazy :p