Fixes#10
Adds toggles to disable direct play of AC3 audio, ASS subtitles, and PGS
subtitles. Also a toggle to force down mixing audio to stereo.
This copies the behavior from the official client. I'm not sure if there
is a way to determine if direct playing AC3 is possible because it can
depend on devices other than the Android TV device such as a sound bar.
So it's up to the user to toggle off support if necessary.
Attribution: This PR uses on [code from the official
client](c775603df4/app/src/main/java/org/jellyfin/androidtv/util/profile/deviceProfile.kt).
Fixes#21
Might also address #18
Fixes an issue with logging using username/password due to network
access on wrong thread exceptions.
Also adds better handling when deleting users or servers, especially if
it's the current one.
