contactbot freshening

[technillogue]

• redirect all other requests to tiprat
• towards a fresh contacbot deploy
• bump contactbot syntax
• seemingly necessary bugfixes
• tiprat bugfixes, sylv totally called this one
• drop unused argument for /register

[cxloe]

going to do some basic things to make this more generic for other providers.

[technillogue]

@cxloe @i-infra not sure if this is missing stuff

[technillogue]

there's probably some other weird bugs hiding but maybe we merge this as is for now?