Some initial changes
Was already merged in Bitbucket before import, marked as merged by the import user
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Hi, Leon here. I did some changes I hope you'll approve of. Most important might be the macro parsing functions, which I believe can now handle nested macros. Also, some changes to Showdown which I feel make it less confusing for prose authors (eg. 1-to-1 line breaks). And, some other stuff related to the CSS.