[Feature] A few nice-to-have requests

[Canowyrms]

1. Allow setting a custom step for adjusting volume via mouse wheel

This would allow the user to specify by how much the volume should be adjusted (on an absolute scale) when the volume is adjusted by scrolling with the mouse wheel. For example, the step value could be 5, so each scroll input adjusts the volume by 5%, or 10 for 10%, and so on. That, or just set the default to 5%/scroll; the default of 1%/scroll is too granular imo.

2. Allow setting a custom step for adjusting playback speed via keyboard shortcut

This would allow the user to specify by how much the playback speed should be adjusted (on an absolute scale) when the playback speed is adjusted by keyboard shortcut. For example, the step value could be 10, so each press of the shortcut adjusts the playback speed by 10%, or 25 for 25%, and so on. I'm a huge fan of 25%/press, but I understand that's not everyone else's speed (heh, excuse the pun), so it'd be great to have an option.

3. Allow seeking via mousewheel scroll input while hovering the progress bar

This would allow the user to seek forward or backward by scrolling the mousewheel while the cursor is hovering over the progress bar. Would ideally use the seekStepSize option.

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Love the extension so far! I'll try to find time in the near future to bang these out, but I can't guarantee anything right now.