Add an attribute that ends a group

[piscopancer]

They have it working in MarkupAttributes editor extension. Can you make EndGroup like him too? I personally feel like it is cleaner than spamming [Group("...")] for every field.

check it out
https://github.com/gasgiant/Markup-Attributes

[vanifatovvlad]

I added GroupNext attribute in group-next-attribute branch with PR #39. Does it work right?