Auto-accept invites to all new bridged rooms

[ericmigi]

• [ ] Add Matrix puppeting to WhatsApp (#12)
• Make sure the Matrix puppeting is used to accept invites in all cases
  • [ ] WhatsApp
  • [x] Hangouts
  • [x] Facebook

[tulir]

This might not require being able to matrix login before the first sync after all, just need to make sure the bridge uses the matrix login to join all the portal rooms

[tulir]

Hangouts and Facebook should now auto-accept portal invites after you login-matrix (including invites from before you did that). The rest (whatsapp) is #12