Neopolitan : gref Section

- For global references

- The only thing it has is the ` - > gref [TODO: Code shorthand span ] tag and an ` > > id [TODO: Code shorthand span ] attribute.

- The id attribute is used to pull the details of a reference from another location (that's TBD on how that will work. It might be a set of pages with just the references, or possible it'll just have the ability to reach into any page.

- I'm not worried about id collisions, I'll just edit anything that collides.