Fix volume adjustment behavior with mouse wheel and touch scroll

[mmstick]

Fixes the volume adjustment behavior when using a mouse wheel or touchpad

Closes #1215
Closes #1512
Closes #1529

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[leviport]

The scroll responsiveness feel pretty sluggish. It feels like it only responds to 2 scroll events per second. The level changes at the same rate whether I'm scrolling very slowly or very quickly. I'm sure it would be frustrating to use if it was too responsive, but it feels like scrolling faster should move the slider faster than it currently does.

Regardless, this definitely fixes the muting bug, and a slow feeling adjustment is better than the level switching to 0 with every change.

[mmstick]

I can adjust the delay before we merge it.

[leviport]

From my gut feeling, it feels like it should be somewhere between 50% to 100% faster. I'd probably like it on the faster side, but that might not be worth the risk of inadvertently turning it up higher than intended and causing discomfort to a headphones user.

[mmstick]

Reduced the delay. 128ms is too much for a touchpad but 192ms is still manageable.

[leviport]

That feels a lot better!