Support for XEP-0136: Message Archiving V1.2
Problem
The message archiving branch doesn't match the current version of XEP-0136: Message Archiving.
Analysis
- Can't recognize the stanza when server pushes new modes, returning 'feature-not-implemented' error.
- Can't close the Archiving Preferences Editting window after removing modes for some contact.
- Doesn't support setting modes for a chat session.
- Doesn't support manual archiving(?)
- Doesn't support archiving management(?)