SC to JS converter work

More work on the python converter.

Change: no longer try to add let in front of variables. Seems to be faster to set them up by hand.

Improve: the part that tries to pick out variables in a string is even less likely to skip into lines it should not if it can't find anything it likes. So hopefully no more lines like ${V.test.test++};

Move a block that updates SC style comments higher since it's quite safe and I was tired of removing it in testing all the time.