Completely rework the way Auxio handles icons.
This is mostly two changes:
1. Removing ImageButton/StyledImageButton for MaterialButton. This is
done by abusing MaterialButton's theming options to make it only show
an icon.
2. Standardizing icon sizes into small, medium, and large categories.
Small is the default, Medium and Large are for edge-cases like the
playback icons which look horrible at 24dp.
3. Abusing the Toolbar to make it follow Material 3 guidelines. This
mostly involved removing the strange icon sizing and correctly padding
the view.
4. Reworking the playback bar to use more, smaller icons, making it
more like a Toolbar in the process (which I like).
Rework how the fab's adaptive functionality works.
Handle fab adaptiveness by using a style instead of a fully custom
view. This helps eliminate a usage of private resources.
