Add scope/patterns for different braces in SQF highlighting

[dslyecxi]

Presumably something that would be done in:
https://github.com/acemod/language-arma-atom/blob/master/grammars/sqf.json

The {}, (), [] braces should be defined such that a user can style them independent of normal text (which they seemingly currently are).

[kymckay]

Not sure how best to do this, other atom packages don't seem to have patterns defined for such things (from what I can see) and there are no standard groups that seem relevant: https://manual.macromates.com/en/language_grammars

@Glowbal @jonpas thoughts?

[jonpas]

It would be nice if it's possible.

[jonpas]

@silentspike what's the status on researching this?

[kymckay]

As above, doesn't seem to be any more to it so I'm not sure if we should or if it should be handled by some other component of atom.

[jonpas]

Moving to backlog then.