Rename PostCSS files to .pcss (#9013)

* Rename PostCSS files to `.pcss`

* Make Stylelint happy

* Delint

* Rename new files too

* delint

* Fix bad comment placement

res/css/views/rooms/_RoomInfoLine.pcss

@@ -0,0 +1,58 @@
+/*
+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_RoomInfoLine {
+    color: $secondary-content;
+    display: inline-block;
+
+    &::before {
+        content: "";
+        display: inline-block;
+        height: 1.2em;
+        mask-position-y: center;
+        mask-repeat: no-repeat;
+        background-color: $tertiary-content;
+        vertical-align: text-bottom;
+        margin-right: 6px;
+    }
+
+    &.mx_RoomInfoLine_public::before {
+        width: 12px;
+        mask-size: 12px;
+        mask-image: url("$(res)/img/globe.svg");
+    }
+
+    &.mx_RoomInfoLine_private::before {
+        width: 14px;
+        mask-size: 14px;
+        mask-image: url("$(res)/img/element-icons/lock.svg");
+    }
+
+    &.mx_RoomInfoLine_video::before {
+        width: 16px;
+        mask-size: 16px;
+        mask-image: url("$(res)/img/element-icons/call/video-call.svg");
+    }
+
+    .mx_RoomInfoLine_members {
+        color: inherit;
+
+        &::before {
+            content: "·"; // visual separator
+            margin: 0 6px;
+        }
+    }
+}