Merge branch 'features/favicons' into 'develop'

Add support for remote favicons

See merge request pleroma/pleroma!2261

docs/API/differences_in_mastoapi_responses.md

@@ -71,6 +71,7 @@ Has these additional fields under the `pleroma` object:
 - `unread_conversation_count`: The count of unread conversations. Only returned to the account owner.
 - `unread_notifications_count`: The count of unread notifications. Only returned to the account owner.
 - `notification_settings`: object, can be absent. See `/api/pleroma/notification_settings` for the parameters/keys returned.
+- `favicon`: nullable URL string, Favicon image of the user's instance
 
 ### Source
 

docs/configuration/cheatsheet.md

@@ -988,3 +988,9 @@ Note: setting `restrict_unauthenticated/timelines/local` to `true` has no practi
 ## Pleroma.Web.ApiSpec.CastAndValidate
 
 * `:strict` a boolean, enables strict input validation (useful in development, not recommended in production). Defaults to `false`.
+
+## :instances_favicons
+
+Control favicons for instances.
+
+* `enabled`: Allow/disallow displaying and getting instances favicons