Use tmux-friendly colour names

The hex values are converted to the closest match among these anyway, so
let's be as explicit as possible.

List all colours:
  for i in {0..255}; do
    printf "\x1b[38;5;${i}m████████████████ ${i}\n"
  done
Add mcabber example configuration
Configure mcabber
Adapt to Redbet environment
Add shorthand for creating a deploy request
Tidy and improve deploy request shorthand
Add test_sparkle script

Runs all tests on all brands, outputs result to text files.