Retain rule and alternation comments. #183
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See test/instaparse/retain_comments.cljc for examples.
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Suggestion for one possible approach to retaining comments in the parsed grammar (issue #178). This adds a new :comments field to nodes in the tree. Comments that are inside rules are attached to alternation nodes. Comments that are determined to be outside of rules (top-level) are attached to the next rule. The :comments value is a sequence of strings. Multiple comments at the same point in the grammar are separate strings in the :comments sequence. I'm new to the instaparse internals so this likely isn't the most optimal or least intrusive way to implement this so I'm proposing this to get a review/feedback on the change.