GBCommentsProcessor: Refactor handling of URLs inside method calls

This provides much simpler handling of the change in https://github.com/tomaz/appledoc/commit/3485e4199b0fe62cbadbccb3fb705921cdee8b75
Merge pull request #369 from paulmelnikow/comments_processor_refactor

GBCommentsProcessor: Refactor handling of URLs inside method calls