feat(inIframe/isEmbedded) add ability to detect generic embedding

On web we detect if we run on an iframe, and on mobile we detect if the
app is one of ours.

react/features/app/actions.web.ts

@@ -7,7 +7,7 @@ import {
 } from '../base/config/actions';
 import { setLocationURL } from '../base/connection/actions.web';
 import { loadConfig } from '../base/lib-jitsi-meet/functions.web';
-import { inIframe } from '../base/util/iframeUtils';
+import { isEmbedded } from '../base/util/embedUtils';
 import { parseURIString } from '../base/util/uri';
 import { isVpaasMeeting } from '../jaas/functions';
 import { clearNotifications, showNotification } from '../notifications/actions';
@@ -102,7 +102,7 @@ export function maybeRedirectToWelcomePage(options: { feedbackSubmitted?: boolea
         // if close page is enabled redirect to it, without further action
         if (enableClosePage) {
             if (isVpaasMeeting(getState())) {
-                const isOpenedInIframe = inIframe();
+                const isOpenedInIframe = isEmbedded();
 
                 if (isOpenedInIframe) {
                     // @ts-ignore

react/features/app/components/App.native.tsx

@@ -12,6 +12,7 @@ import { clientResized, setSafeAreaInsets } from '../../base/responsive-ui/actio
 import DimensionsDetector from '../../base/responsive-ui/components/DimensionsDetector.native';
 import { updateSettings } from '../../base/settings/actions';
 import JitsiThemePaperProvider from '../../base/ui/components/JitsiThemeProvider.native';
+import { isEmbedded } from '../../base/util/embedUtils.native';
 import { _getRouteToRender } from '../getRouteToRender.native';
 import logger from '../logger';
 
@@ -87,7 +88,7 @@ export class App extends AbstractApp<IProps> {
 
         const liteTxt = AppInfo.isLiteSDK ? ' (lite)' : '';
 
-        logger.info(`Loaded SDK ${AppInfo.sdkVersion}${liteTxt}`);
+        logger.info(`Loaded SDK ${AppInfo.sdkVersion}${liteTxt} isEmbedded=${isEmbedded()}`);
     }
 
     /**

react/features/app/middleware.ts

@@ -7,7 +7,7 @@ import { SET_ROOM } from '../base/conference/actionTypes';
 import { CONNECTION_ESTABLISHED, CONNECTION_FAILED } from '../base/connection/actionTypes';
 import { getURLWithoutParams } from '../base/connection/utils';
 import MiddlewareRegistry from '../base/redux/MiddlewareRegistry';
-import { inIframe } from '../base/util/iframeUtils';
+import { isEmbedded } from '../base/util/embedUtils';
 
 import { reloadNow } from './actions';
 import { _getRouteToRender } from './getRouteToRender';
@@ -52,7 +52,7 @@ function _connectionEstablished(store: IStore, next: Function, action: AnyAction
     // @ts-ignore
     const { history, location } = window;
 
-    if (inIframe()) {
+    if (isEmbedded()) {
         return;
     }