Simplify function names

[jasonLaster]

Summary of Changes

• This decodes Firefox's totally crazy interpretation of anonymous function names.
• Why do decode the string, and not use babel
  • the string is a very clear spec with many rules, it is better than what we do w/ inference now
  • we don't want to load and parse every file we get in the call stack if we don't have to
• will this work? if the regex's fail to match we'll show the original. This code will not throw errors. (i think)

Test Plan

You bet!

Screenshots/Videos (OPTIONAL)

[jbhoosreddy]

Looks good to me!