AniMe Matrix smooth dimming

[KelseyHigham]

Is your feature request related to a problem? Please describe.
When I'm using AniMe Matrix at night, or in a public place, I want to dim the Matrix to the point where it's not distracting. But the Dim setting is still too bright!

Describe the solution you'd like
I'd like a slider to artificially dim the Matrix by dimming the image itself before sending it to the Matrix. This wouldn't help with the brightness of built-in images and animations, but it would help with custom ones.

Describe alternatives you've considered
Replacing the discrete brightness values with a smooth slider, which automatically sets the Off/Dim/Medium/Bright values for the built-in animations, would be really cool.

Additional context
I've used a dimmed image on my Matrix, and it's a lot nicer. It takes up a negligible amount of battery, and it's not distracting, so I can leave it on full-time.
<- too bright
<- just right

[seerge]

@KelseyHigham hello, this build should have a "Contrast" slider in Picture settings, which is effectively a multiplier for each pixel brightness. Just set it to something like 30% and you should be good
GHelper.zip