XEP-0443: added IM notes and Easy Onboarding
Added to IM Category specification of note:
- Message Styling (XEP-0393)
- Extended Channel Search (XEP-0433)
- Message Retraction (XEP-0424)
- Message Moderation (XEP-0425)
Added to Future Development:
- Easy User Onboarding (XEP-0401)
- Pre-Authenticated Roster Subscription (XEP-0379)
- Pre-Authenticated In-Band Registration (XEP-xxxx)