Implement requires autofill

I just implemented the requires autofill. I had to update scss-comment-parser and cdocparser to 0.5.0-rc1/0.4.0-rc1. 
These include the ability to have a `default` and `extend` function. 

I also added a `@allowExtend` annotation to specify a list of allowed annotations that will be extended. (Might be useful if there is something wrong)