 Version 6.15.8

* re-worked action bar and menu in more fragments in Jetpack Compose
* open-drawer icon on the action bar is set in accordance with the page
* title of "Subscriptions" is removed
* video player is fully in Compose including action bar and menu
* reenabled cast button in video player (in Play app, can someone verify its functioning?)
* BugReport activity is in Compose
* likely fixed image on PlayUI not updating issue
* fixed an efficiency issue of possibly duplicate monitoring of episodes' states when a list is changed
* removed recyclerview dependency
* various xml files removed or cleaned
* updated Compose dependencies
