[ADD] Respect MIME, start bridging leaves/kicks

Wow, this one _wasn't_ pushed at 3AM, Outstanding.

XEPS-TBD.TXT

@@ -10,7 +10,7 @@ Somewhat implemented XEPs:
         IM platforms I won't mention), so this doesn't sound too bad to do
                 HALF-IMPLEMENTED: Removing reacts won't work.
     ~ https://xmpp.org/extensions/xep-0184.html
-        no one wants to send me receipts :(((((((((((((
+        Only Matrix->XMPP as of now
 
 For future XEPs:
     - https://xmpp.org/extensions/xep-0421.html
@@ -31,6 +31,10 @@ For future XEPs:
         Stickers are great. Matrix and XMPP somewhat has support for them, so
         might be a nice-to-have, and also to push over XMPP support.
 
+    - https://xmpp.org/extensions/xep-0050.html
+        Ad-hoc commands that bridge maintainers can deal with XMPP-style are 
+        also a nice to have.
+
 ON STANDBY BECAUSE THESE HAVE BEEN TERRIBLE TO DEAL WITH AND WHO KEEPS WRITING
 THESE I WANT TO SEND THEM A NICE, BRIGHT GIFT:
     (x) https://xmpp.org/extensions/xep-0084.html