📎 CSS Parser: Parse all border long-hand properties

[faultyserver]

https://drafts.csswg.org/css-backgrounds/#borders

Let's see just how much code this takes...I think it'll be a good indication if we should consider re-structuring to reduce the pure number of nodes that come out of this. We'll be able to re-use a lot of value node types since the properties share the same value definitions a lot, but there are still ~20 properties that all get a unique type.