Gmail Label Colorizer per pjpscriv

A small, simple extension for making any-color labels in Gmail.

Modifies the pre-existing "Add custom color" modal in Gmail to use a simple
color picker. Automatically sets text to black or white depending on the background.

Currently a very bare-bones v1. If you have any issues or feature requests -
post them to https://github.com/pjpscriv/gmail-label-colorizer/issues