Use blue in place of orange
Set tmux message-bg to match status-bg

- status-bg is the status bar background colour.

- message-bg is the background colour used for displaying messages and
  when typing :-commands (^b:).
Use explicit hex syntax for colour specifications

Not sure if 'brightwhite' is not a valid colour or if hex works better
for some reason or other. In either case let's use hex, because it
works.
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.