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/room_settings/_AliasSettings.pcss

@@ -0,0 +1,46 @@
+/*
+Copyright 2019 New Vector Ltd.
+
+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_AliasSettings_editable {
+    border: 0px;
+    border-bottom: 1px solid $strong-input-border-color;
+    padding: 0px;
+    min-width: 240px;
+}
+
+.mx_AliasSettings_editable:focus {
+    border-bottom: 1px solid $accent;
+    outline: none;
+    box-shadow: none;
+}
+
+.mx_AliasSettings {
+    summary {
+        cursor: pointer;
+        color: $accent;
+        font-weight: 600;
+        list-style: none;
+
+        // list-style doesn't do it for webkit
+        &::-webkit-details-marker {
+            display: none;
+        }
+    }
+
+    .mx_AliasSettings_localAliasHeader {
+        margin-top: 35px;
+    }
+}