Add ActiveModColorEffect to default Chrysalis build and allow its colors to be tweaked

[glasser]

I use a custom build rather than the Chrysalis default for my Model100 only to turn on ActiveModColorEffect (since I find sticky keys to be unusable without it). I'd love to be able to go back to the default firmware, if this was built-in. (I also would like to be able to tweak the colors, as the default don't work well for my vision.)

(Originally keyboardio/Chrysalis#1271)