Add token range implementation for pf2e

[CarlosFdez]

That said, pf2e diagonal attacks have a special rule where 10 foot reach (and only 10 foot reach) can reach 2 squares diagonally. Would you have any insight on a good way to handle that rule that would play along with the module?

[Aedif]

I'll probably need to provide a way for SystemRange to return some sort of custom range measurement function together with the ranges instead of just an array of numerical values.

I have a solution in mind. I'll accept this for now and finish this off myself. Thanks for the submission.