Gracefully log local and closure object types

[sprout42]

Some small changes to gracefully fail on local names and closures. the closures were the ones causing me the most trouble.

I'm not completely sure about how I implemented the cursor position save in itanium_demangler/itanium_demangler/__init__.py? that appears counter to how the tool seems to work. I tried to look into it further to figure out how to gracefully fail out without consuming the string when _parse_special found a situation it couldn't handle but in the time (and attention) I have I was not able to figure out a more graceful way to do that.