[Contribution Request] Various enhancements for logarithmic volume scale settings

[Dwscdv3]

Hi EarTrumpet team,

I have experimented with the logarithmic volume scale (#228) under community settings and found several issues. I'm interested to work on these:

• Currently the logarithmic scale is not applied to volume meters, only sliders. This creates inconsistency on the UI and making the meters and sliders not visually comparable.
• Currently the dynamic range is fixed to 50 dB, it may be better make it adjustable to adapt for different scenarios.
• Show the actual dBFS value on the label instead of percentage, just like DAWs and other professional softwares (e.g. OBS Studio) do. (I'm not sure about this, open for discussion.)

By the way, I have seen several issues reporting EarTrumpet's sliders mismatch with Windows sliders while the actual reason is they forgot the logarithmic scale setting is enabled, or they just enabled without knowing what exactly this setting do. Do we need to inform the user beside the switch that mismatch is by design, not a bug?

Looking forward to your feedback or thoughts.