Feature request: Env: support backticks?

[a-h]

Not sure if this is just my vim config, but the underscores aren't liked by Markdown.

This would usually lead me to putting them in backtick fences, but not sure if xc supports this.

[joerdav]

Could trim backticks from values for Env, Directories and Requires. And add it to the list of runes that are stripped out from command names to allow back ticks there too.