Earpiece switcher and overlay (#3347)

* Add a global control for toggling earpiece mode

This will be used by Element X to show an earpiece toggle button in the header.

* Add an earpiece overlay


* Fix header
The header needs to be passed forward as a string to some components and as a bool (hideHeader) to others.
Also use a enum instead of string options.

* fix top clipping with header


* hide app bar in pip

* revert android overlay app_bar

* Modernize AppBarContext

* Style header icon color as desired and switch earpice/speaker icon

* fix initial selection when using controlled media

* Add "Back to video" button

* fix tests

* remove dead code

* add snapshot test

* fix back to video button

* Request capability to learn the room name

We now need the room name in order to implement the mobile (widget-based) designs with the app bar.

* Test the CallViewModel output switcher directly

---------

Co-authored-by: Timo <toger5@hotmail.de>

locales/en/app.json

@@ -79,6 +79,11 @@
     "use_to_device_key_transport": "Use to device key transport. This will fallback to room key transport when another call member sent a room key"
   },
   "disconnected_banner": "Connectivity to the server has been lost.",
+  "earpiece": {
+    "overlay_back_button": "Back to video",
+    "overlay_description": "Only works while using app",
+    "overlay_title": "Earpiece only mode"
+  },
   "error": {
     "call_is_not_supported": "Call is not supported",
     "call_not_found": "Call not found",
@@ -177,6 +182,7 @@
       "default": "Default",
       "default_named": "Default <2>({{name}})</2>",
       "earpiece": "Earpiece",
+      "loudspeaker": "Loudspeaker",
       "microphone": "Microphone",
       "microphone_numbered": "Microphone {{n}}",
       "speaker": "Speaker",