feat(preferences): extension modals into extension panes (#683)

* feat(preferences): show inline extensions in extensions pane

* wip

* wip

* refactor: convert ComponentView to React component

* refactor: convert ComponentView to React component

* chore: fix merge conflicts

* feat: don't show features whose `area` is "room", update modal items' icons in Preferences menu

* chore: fix TS error

* feat: don't show 2FA Manager in modal-based component

* feat: remove `ExtendedDataReloadComplete` event, since Extensions Manger is being removed from the app

* chore: avoid hardcoded values in svg image, optimize `if` condition

* chore: remove remnant comment

* fix: fix typescript errors

Co-authored-by: vardanhakobyan <vardan_live@live.com>

app/assets/javascripts/components/ComponentView/IsDeprecated.tsx

@@ -0,0 +1,32 @@
+import { FunctionalComponent } from 'preact';
+
+interface IProps {
+  deprecationMessage: string | undefined;
+  dismissDeprecationMessage: () => void;
+}
+
+export const IsDeprecated: FunctionalComponent<IProps> = ({
+                                                            deprecationMessage,
+                                                            dismissDeprecationMessage
+                                                          }) => {
+  return (
+    <div className={'sn-component'}>
+      <div className={'sk-app-bar no-edges no-top-edge dynamic-height'}>
+        <div className={'left'}>
+          <div className={'sk-app-bar-item'}>
+            <div className={'sk-label warning'}>
+              {deprecationMessage || 'This extension is deprecated.'}
+            </div>
+          </div>
+        </div>
+        <div className={'right'}>
+          <div className={'sk-app-bar-item'} onClick={dismissDeprecationMessage}>
+            <button className={'sn-button small info'}>
+              Dismiss
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};