Add LeadingCommentSpace linter

Add linter which checks for a space following the `#` in comments.

Change-Id: I1d8b428c671d78bd1cd60ce9515496c3c50cfe42
Reviewed-on: http://gerrit.causes.com/42349
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>