[slang] Fix bug with SignalEventControl iff clause emitting.

[likeamahoney]

There is copypasta bug with SignalEventControl iffCondition emitting during it's AST constructing. Right hand of iff was constructed from left hand part.

And I also added support for iffCondition serializing.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.23%. Comparing base (04dedf0) to head (38fe37e).

Additional details and impacted files

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[MikePopoloski]

Nice, thanks for fixing.