Replace the hodge-podge framework of state restoration and URI playing
with a single "delayed action" system.
Auxio's initialization routine is a total cluster----. This is mostly
because it involves multiple asynchronous operations such as music
loading, state restore, and service starting which tend to make it
highly prone to race conditions and other insanity.
In particular, the way Auxio would attempt to restore playback and
handle file opening was a spaghetti pile of bad API boundaries and
dubious UI code. This has not changed. I want to move this routine
to the service, but it's lifecycle is also sh------ed to such an
extent where that would be nearly impossible. Instead, this commit
introduces a new "delayed action" system that bites the bullet and
allowes PlaybackViewModel to accept a context and an action in
return for initializing playback...eventually.
I tried my best to eliminate as much memory leaks as I physically
could here, but could only go so far. Still though, even this insane
system is better than the UI-level LiveData shenanigans I did
previously, and actually works compared to the broken android
components that google keeps wanting you to use.
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