Completely rework Auxio's iconography based on the new material symbols
icon set.
This does the following:
1. Switches the sharp + filled icon style to an outlined + round icon
style.
2. Removes 32dp icons from everywhere except the playback panel.
This does not:
1. Actually handle optical sizes right. This is going to take some more
work to make it harmonious with the current UI.
2. Update margins in some places to be harmonious with the new icons.
This is also going to take some more work to do properly.
Update the small/wide widgets to show just the cover art and controls.
This is for two reasons:
1. The old layouts wasted space, which didn't make them look very good
2. I want to add a more Material3-eque "Stylistic" widget option for
the people who want them. Doing this allows me to pack that option into
the widget without having to add a new option.