Add hashing to curve

[Nashtare]

The current generator point, while not random (as coming from the "Topos" encoded string), still suffers from a non-standard generation procedure. In addition, having a hash-to-curve algorithm would be a great add-on as it can serve multiple purposes.

Following the draft-cfrg-hash-to-curve (section 6.6 p26), it seems that SWU would be the one to go for. The generator point would then be regenerated, following the proper hash-to-curve implementation.