Finally unify all icon activation states under the new grade modifier
in Material Symbols.
This provides similar clarify to the dot/greyed state, but without
inconsistent meanings. The shuffle icon did have to be bolded a little
more though, as the grade did not seem to do much.
Further rework the button layout to be alike to other modern widgets.
This changeset transforms the play button into a FAB-ish thing,
makes spacing coherent between the uses of each layout, and adds
spacers to make the buttons layout in a more appealing way.
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.
