RST writer: refactor separating inline transformation logic from writ… #4438
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this pull request is just about refactoring, and an enabler for solutions to #4434 and #4368.
without introducing these changes it's impossible to perform bottum-up transformations on inlines before rendering because single inlines are visited and rendered in the same functions.
after these changes the rendering step is explicit and separated from the visiting logic so that transformation functions can be applied depth-first. as a showcase of the functionality this enables i wrote a solution to #4434 on top of this commit