Create cog disabling API (#4043)

* create cog disbale base

* Because defaults...

* lol

* announcer needs to respect this

* defaultdict mishap

* Allow None as guild

- Mostly for interop with with ctx.guild

* a whitespace issue

* Apparently, I broke this too

* Apply suggestions from code review

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

* This can probably be more optimized later, but since this is a cached value, it's not a large issue

* Report tunnel closing

* mod too

* whitespace issue

* Fix Artifact of prior method naming

* these 3 places should have the check if i understood it correctly

* Announce the closed tunnels

* tunnel oversight

* Make the player stop at next track

* added where draper said to put it

* Apply suggestions from code review

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>
Co-authored-by: Drapersniper <27962761+drapersniper@users.noreply.github.com>

docs/guide_cog_creation.rst

@@ -229,3 +229,12 @@ Not all of these are strict requirements (some are) but are all generally advisa
 
   - We announce this in advance.
   - If you need help, ask.
+
+14. Check events against ``bot.cog_disabled_in_guild``
+
+  - Not all events need to be checked, only those that interact with a guild.
+  - Some discretion may apply, for example,
+    a cog which logs command invocation errors could choose to ignore this
+    but a cog which takes actions based on messages should not.
+
+15. Respect settings when treating non command messages as commands.