Clojure: Use ;; instead of ; for line comments

[joaomoreno]

@plexus says:

LISPs in general and Clojure in particular by convention uses double semicolons
for regular line comments. Single semicolons are reserved for trailing comments
at the end of a line, and are treated (aligned) differently in some editors,
notably Emacs.

[joaomoreno]

@plexus says:

This is something a lot of Calva users are complaining about, blaming Calva even though it's really an upstream issue: BetterThanTomorrow/calva#971

[joaomoreno]

@alexr00 says:

Thanks for the PR! Can you point me to some language documentation so I can learn more?

[joaomoreno]

@plexus says:

See for example the community style guide: https://github.com/bbatsov/clojure-style-guide#comments

[joaomoreno]

@plexus says:

Thanks for the quick merge!

[joaomoreno]

@ArturoDent says:

@plexus - purely as a very short-term workaround until the next release in a couple of weeks, you can change lineComment form with this extension: Custom Language Properties.

"custom-language-properties": {
  "clojure.comments.lineComment": ";;"
 },

[joaomoreno]

@plexus @alexr00 We have reverted the decision to extract extensions from the microsoft/vscode repo, so I've recreated @plexus's PR from vscode-clojure, so we don't lose the discussion.