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

src/app/molecules/image-pack/ImagePackUsageSelector.jsx

@@ -0,0 +1,41 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import { MenuHeader, MenuItem } from '../../atoms/context-menu/ContextMenu';
+import CheckIC from '../../../../public/res/ic/outlined/check.svg';
+
+function ImagePackUsageSelector({ usage, onSelect }) {
+  return (
+    <div>
+      <MenuHeader>Usage</MenuHeader>
+      <MenuItem
+        iconSrc={usage === 'emoticon' ? CheckIC : undefined}
+        variant={usage === 'emoticon' ? 'positive' : 'surface'}
+        onClick={() => onSelect('emoticon')}
+      >
+        Emoji
+      </MenuItem>
+      <MenuItem
+        iconSrc={usage === 'sticker' ? CheckIC : undefined}
+        variant={usage === 'sticker' ? 'positive' : 'surface'}
+        onClick={() => onSelect('sticker')}
+      >
+        Sticker
+      </MenuItem>
+      <MenuItem
+        iconSrc={usage === 'both' ? CheckIC : undefined}
+        variant={usage === 'both' ? 'positive' : 'surface'}
+        onClick={() => onSelect('both')}
+      >
+        Both
+      </MenuItem>
+    </div>
+  );
+}
+
+ImagePackUsageSelector.propTypes = {
+  usage: PropTypes.oneOf(['emoticon', 'sticker', 'both']).isRequired,
+  onSelect: PropTypes.func.isRequired,
+};
+
+export default ImagePackUsageSelector;