This adds the special syntax required for operators, with test cases

[agjohnson]

Addresses special operator syntax on UIDs, including:

• Prefix.operator ==(args)
• Prefix.operator !=(args)
• Prefix.operator true(args)

And so on, from overloadable operators at: https://msdn.microsoft.com/en-us/library/8edha89s.aspx

• Prefix.implicit operator Prefix.ReturnType(arg)

As well as the invalid, but still parseable for our use case:

• Prefix.Foo(args)

This closes #12, which is an issue with argument ids, not fullName ids, which we only have to use in argument lists currently.