Move user list from reactions to its own component, make favs and rts use it

src/components/user_list_popover/user_list_popover.js

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+
+const UserListPopover = {
+  name: 'UserListPopover',
+  props: [
+    'users'
+  ],
+  components: {
+    Popover: () => import('../popover/popover.vue'),
+    UserAvatar: () => import('../user_avatar/user_avatar.vue')
+  }
+}
+
+export default UserListPopover

src/components/user_list_popover/user_list_popover.vue

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+<template>
+  <Popover
+    trigger="hover"
+    placement="top"
+    :offset="{ y: 5 }"
+  >
+    <template slot="trigger">
+      <slot />
+    </template>
+    <div
+      slot="content"
+      class="reacted-users"
+    >
+      <div v-if="users.length">
+        <div
+          v-for="(user) in users"
+          :key="user.id"
+          class="reacted-user"
+        >
+          <UserAvatar
+            :user="user"
+            class="avatar-small"
+            :compact="true"
+          />
+          <div class="reacted-user-names">
+            <!-- eslint-disable vue/no-v-html -->
+            <span
+              class="reacted-user-name"
+              v-html="user.name_html"
+            />
+            <!-- eslint-enable vue/no-v-html -->
+            <span class="reacted-user-screen-name">{{ user.screen_name }}</span>
+          </div>
+        </div>
+      </div>
+      <div v-else>
+        <i class="icon-spin4 animate-spin" />
+      </div>
+    </div>
+  </Popover>
+</template>
+
+<script src="./user_list_popover.js" ></script>
+
+<style lang="scss">
+@import '../../_variables.scss';
+
+.reacted-users {
+  padding: 0.5em;
+}
+
+.reacted-user {
+  padding: 0.25em;
+  display: flex;
+  flex-direction: row;
+
+  .reacted-user-names {
+    display: flex;
+    flex-direction: column;
+    margin-left: 0.5em;
+    min-width: 5em;
+
+    img {
+      width: 1em;
+      height: 1em;
+    }
+  }
+
+  .reacted-user-screen-name {
+    font-size: 9px;
+  }
+}
+
+</style>