This derivation can add arbitrary new Sublime syntaxes to bat's syntax
file, which is used by cheddar.
Included is a Prolog syntax. It is kind of mediocre, but better than
nothing.
Change-Id: I6ceecbc86a5dfba5886cd27bd5114721845446a7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/348
Reviewed-by: lukegb <lukegb@tvl.fyi>
