catch many many more corner cases with 'try'

catch many many more corner cases with 'try'

if the input compile_ctx has REJECT or RETURN for an action, AND
there's a "try / catch" for it, we do NOT have the try actions
stay "REJECT" or "RETURN"

also change the behavior so catch { ... } means "catch ALL" of the
rcodes.

the error rcodes are special, too :(