Fixes Funscript.Typescript.Exe crash on parsing errors

Prevents Funscript.Typescript.Exe from crashing  on parsing errors.

Logs the names of the definition files that failed to parse to console and writes detailed error messages for all parsing failures to failed-parsing.txt

Does NOT fix current parsing errors encountered when parsing [DefinitelyTyped](https://github.com/borisyankov/DefinitelyTyped) definitions