PineTime color filter

[Riksu9000]

Colors can look very different on different screens. Computer monitors can be calibrated, and then with simple filters, you can imitate a worse quality screen.

I propose adding filters that can emulate the colors and saturation of different PineTimes on a sRGB calibrated monitor, to make it easier to develop UI that looks good on different devices. I can help tune the filters according to my devices.

I got this idea after writing about the issue here. InfiniTimeOrg/InfiniTime#1506 (comment)