Add a circular indicator to playback icons.
Sometimes it can be too difficult to tell apart the active and inactive
states of the shuffle/loop icons. However, there is really no good way
to improve the contrast on these icons without some kind of muddled UX
fragmentation, or god-awful design. Try to settle on the okay-est
version, which is to use colorPrimary with a dot indicator on views we
control, and use a more muddled semi-transparent icon on views we don't
control, like notifications and widgets.
Add a "Dynamic" replaygain mode inspired by the FooBar2000 plugin. This
will automatically determine whether the playback is in an album or not
and use the album gain or track gain accordingly.
Switch auxio to a single-queue system. "Play next" adds songs to the top
of the queue, similar to before, and then "Add to queue" adds songs to
the bottom of the queue. This enables many more enhancements to be made
to the playback experience, at the cost of a feature I preferred.
Resolves#44.
Refactor sorting again to support free-floating ascending/descending
values on every single sort mode. This enables greater freedom in how
users can sort their music and allows me to finally get rid of the
old legacy sematic sorting modes that chose their ascending/decending
order depending on how they wanted it.
