Add support for Vanilla game

[GABRlEL]

To support Vanilla game playing aswell, we need a way for the Regular Track region to be played from the Vanilla game. Tmk this currently isn't possible due to the hash checking mechanic. In general we need a workflow/way for players to just patch their game with RWFC to then play online Regular VS on RWFC

[ppebb]

I'm unsure how we could implement this on an unmodified client without making the existing hash logic easy to circumvent. The hash checks aren't a lot in the means of security so it could be viable to just allow a client submitting no pack_id to always connect.