Custom emoji & Sticker support (#686)

* Remove comments

* Show custom emoji first in suggestions

* Show global image packs in emoji picker

* Display emoji and sticker in room settings

* Fix some pack not visible in emojiboard

* WIP

* Add/delete/rename images to exisitng packs

* Change pack avatar, name & attribution

* Add checkbox to make pack global

* Bug fix

* Create or delete pack

* Add personal emoji in settings

* Show global pack selector in settings

* Show space emoji in emojiboard

* Send custom emoji reaction as mxc

* Render stickers as stickers

* Fix sticker jump bug

* Fix reaction width

* Fix stretched custom emoji

* Fix sending space emoji in message

* Remove unnessesary comments

* Send user pills

* Fix pill generating regex

* Add support for sending stickers

Author: ajbura

public/res/ic/outlined/sticker.svg

@@ -26,10 +26,10 @@
   &--icon {
     @include dir.side(padding, var(--sp-tight), var(--sp-loose));
 
-    .ic-raw {
-      @include dir.side(margin, 0, var(--sp-extra-tight));
-      flex-shrink: 0;
-    }
+  }
+  .ic-raw {
+    @include dir.side(margin, 0, var(--sp-extra-tight));
+    flex-shrink: 0;
   }
 }