Implement message forwarding (XEP-0297)

[mremond]

Add the ability to forward messages to other contacts or rooms.

Technical Implementation

• Use XEP-0297 (Stanza Forwarding) for the protocol
• Forwarded messages should show:
  • Original sender name
  • Original timestamp
  • Visual indication that it's a forwarded message
• Support forwarding to:
  • 1:1 contacts
  • MUC rooms
• Action: We should be able to click the forward and access it if it is on a public room ?

Privacy considerations

• Which messages should we be allowed to forward ?

References

• XEP-0297: Stanza Forwarding