- moved as much logic out of the macros as possible
- moved most logic into new ResultBuilder class, which wraps ExpressionResultBuilder (may take it over next), subsumes ResultAction and also takes place of ExpressionDecomposer.
This introduces many SRP violations - but all in the name of minimising macro logic!
When the section tracking code was rewritten a while back to simplify and iron out some bugs the order of evaluation was changed so that each new section was skipped on the first run through.
This had unwelcome consequences for some people.
This commit restores the original semantics (while maintaining the simpler, less buggy, new code).
