Feature enhancement: add colour correction

[juanjsebgarcia]

I know this is a big ask, but would be a great feature to allow contrast, saturation, hue, gamma adjustments on the Immich-Frame Android app settings menu. Some of these Frameo frames aren't very well balanced (typically too blue) and it would be stellar to be able to change this in the settings.

[juanjsebgarcia]

I've implemented this, will try and get a PR open this week.
Brightness, Contrast, Saturation per channel (RGB), and a inexpensive gamma approximation

[juanjsebgarcia]

#40

-15 blue, a small bump in contrast and 0.9 on gamma has made my frameo frame look so much more premium!

I guess I'll close my own request :)