Add Remote App & UI updates. (#1451)

* Alpha order sub-menus
* WIP Getting Remote types outlined
* WIP building UI
* WIP adding RemoteButton control
* WIP Fix build
* WIP Basic editing support
* Border on the active button
* Make TxView2 sane
* Add easier RGB color creation from uint32
* Center some button icons
* WIP Remote - main UI
* WIP main UI mostly working, can send
* Add 'join' utility
* WIP save/load
* Pre-alloc buttons to prevent focus dangling
* Alpha order settings/debug pages
* Add UI for picking capture and set frequency
* WIP Getting really close now
* Fix path for init name
* Some fit & finish

firmware/application/apps/ui_playlist.cpp

@@ -386,6 +386,7 @@ PlaylistView::PlaylistView(
         &waterfall,
     });
 
+    ensure_directory(u"PLAYLIST");
     waterfall.show_audio_spectrum_view(false);
 
     field_frequency.set_value(100'000'000);