Add P3 gamut mode

[uloco]

Newer terminals can enable a wider gamut for colors. This messes up the original colors of bluloco making everything more saturated. While more colors can be displayed I find not all of the colors look good when interpreted as P3. This setting is default in alacritty and iTerm2 (beta currently).

I want to adjust the bluloco colors for use with P3 gamut color space displays / settings to make it look better in general. For example the reds (type) and yellows(string) and parameters (lightblue) look too saturated and distracting imo.

There could be a setting in the config to adjust how the colors should be interpreted. I would need to create a new theme based on this setting, which is better balanced.

Need to get a good calibrated P3 screen first though.