New group call experience: Call tiles (#9332)

* Add call tiles

* Factor CallDuration out into a reusable component

* Correct the separator character in LiveContentSummary

res/css/views/rooms/_LiveContentSummary.pcss

@@ -0,0 +1,56 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_LiveContentSummary {
+    color: $secondary-content;
+
+    .mx_LiveContentSummary_text {
+        &::before {
+            display: inline-block;
+            vertical-align: text-bottom;
+            content: '';
+            background-color: $secondary-content;
+            mask-size: 16px;
+            width: 16px;
+            height: 16px;
+            margin-right: 4px;
+        }
+
+        &.mx_LiveContentSummary_text_video::before {
+            mask-image: url('$(res)/img/element-icons/call/video-call.svg');
+        }
+
+        &.mx_LiveContentSummary_text_active {
+            color: $accent;
+
+            &::before {
+                background-color: $accent;
+            }
+        }
+    }
+
+    .mx_LiveContentSummary_participants::before {
+        display: inline-block;
+        vertical-align: text-bottom;
+        content: '';
+        background-color: $secondary-content;
+        mask-image: url('$(res)/img/element-icons/group-members.svg');
+        mask-size: 16px;
+        width: 16px;
+        height: 16px;
+        margin-right: 2px;
+    }
+}