Problem 60734. Conditional transpose

@Dyuman thanks for the tip. I avoided checking for "if " since it's also possible to write "if(condition)", but perhaps I could just check for both "if " and "if(". That, or try to work with the parse tree instead of fishing for textual matches...

@Dyuman I've updated the test suite, so using functions with "if" in their names should now work. Existing solutions have been rescored.

@Dyuman I've updated the test suite to check for banned keywords/functions based on the parse tree. Hopefully this'll be more robust and cause fewer false positives.