Volume controls get stuck at 9 on MacOS

[Riot]

because floating point conversion is much more broken there, for some reason

[Riot]

fuzzy matching for volume control changes to work around macos ridiculously bad floating point conversions, resolves #276

→ <<cset 6715dd0d340d>>

[Riot]

tweaking volume increment and decrement logic to be closer to the underlying type and show round number increments, resolves #292, re #276

→ <<cset a32370f8d18f>>

[Riot]

fix music volume button, resolves #298, re #292 and #276

→ <<cset 8e3d47b318c8>>

[Riot]

Removing milestone: Beta (automated comment)