Specification may need updating (e.g. padding between rules)

[hughbe]

From #6

I've adapted the code / specs to typescript. My goal is to output the rules as json: https://github.com/asklar/rwzreader
I did find some issues with the original code/spec... in retrospect I should have taken notes but I forgot, sorry about that :(
IIRC there is additional padding needed between rules (but not for the last rule) which wasn't called out in the spec. I'm sure I've probably introduced a bug or three in my impl (I don't have to care about older than 2019 so this simplifies things a bit), but this is a good starting point :)

Double check this and update spec as possible