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/ImagePackItem.scss

@@ -0,0 +1,43 @@
+@use '../../partials/flex';
+@use '../../partials/dir';
+
+.image-pack-item {
+  margin: 0 var(--sp-normal);
+  padding: var(--sp-tight) 0;
+  display: flex;
+  align-items: center;
+  gap: var(--sp-normal);
+
+  & .avatar-container img {
+    object-fit: contain;
+    border-radius: 0;
+  }
+
+  &__content {
+    @extend .cp-fx__item-one;
+  }
+
+  &__usage {
+    display: flex;
+    gap: var(--sp-ultra-tight);
+    & button {
+      padding: 6px;
+    }
+    & > button.btn-surface {
+      padding: 6px var(--sp-tight);
+      min-width: 0;
+      @include dir.side(margin, var(--sp-ultra-tight), 0);
+    }
+  }
+
+  &__btn {
+    display: none;
+  }
+  &:hover,
+  &:focus-within {
+    .image-pack-item__btn {
+      display: flex;
+      gap: var(--sp-ultra-tight);
+    }
+  }
+}