[ModLog API] Add default casetypes, remove need for a specific auditlog action (#2901)

* I know this needs a changelog entry and docs still

* update tests for new behavior

* update docs, filter; add changelog

* Ready for review

* stop fetching the same Audit logs when the bot is the mod

* I forgot to press save

* fix a comprehension

* Fix AttributeError

* And the other place that happens

* timing fixes

tests/cogs/test_mod.py

@@ -5,13 +5,7 @@ from redbot.pytest.mod import *
 
 @pytest.mark.asyncio
 async def test_modlog_register_casetype(mod):
-    ct = {
-        "name": "ban",
-        "default_setting": True,
-        "image": ":hammer:",
-        "case_str": "Ban",
-        "audit_type": "ban",
-    }
+    ct = {"name": "ban", "default_setting": True, "image": ":hammer:", "case_str": "Ban"}
     casetype = await mod.register_casetype(**ct)
     assert casetype is not None