Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

webapp/boards/loaders/globalScssClassLoader.js

@@ -0,0 +1,23 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+function blockList(line) {
+    return line.startsWith('.focalboard-body') ||
+        line.startsWith('.GlobalHeaderComponent') ||
+        line.startsWith('.boards-rhs-icon') ||
+        line.startsWith('.focalboard-plugin-root') ||
+        line.startsWith('.FocalboardUnfurl') ||
+        line.startsWith('.CreateBoardFromTemplate');
+}
+
+module.exports = function loader(source) {
+    var newSource = [];
+    source.split('\n').forEach((line) => {
+        if ((line.startsWith('.') || line.startsWith('#')) && !blockList(line)) {
+            newSource.push('.focalboard-body ' + line);
+        } else {
+            newSource.push(line);
+        }
+    });
+    return newSource.join('\n');
+};