Move Nri.Outline and Nri.Outline.Keyed to noredink-ui

[tesk9]

[BrianHicks]

I looked at doing this today and it ended up being to big for the time I have. For a future person:

• this needs Nri.Outline and Nri.Outline.Keyed
• those use Nri.Outline.Utils, which will need to be ported but private
• they also use Nri.Palette, which after glancing between that and Nri.Ui.Palette.V1 I think would just be a drop-in.

I made some ASCII art for the docs because I couldn't remember what parts did what. Here they are:

For view:

┌─ Title ──────────────────────────────┐
│                                      │
│  Content content content             │
│                                      │
└──────────────────────────────────────┘
┌─ Title ──────────────────────────────┐
│                                      │
│  Content content content             │
│                                      │
└──────────────────────────────────────┘

for row:

┌─ Title ──────────────────────────────┐
│                                      │
│  Content content content             │
│                                      │
└─┬────────────────────────────────────┘
  │ ┌─ Child #1 ───────────────────────┐
  │ │                                  │
  ├─┤                                  │
  │ │                                  │
  │ └──────────────────────────────────┘
  │ ┌─ Child #2 ───────────────────────┐
  │ │                                  │
  └─┤                                  │
    │                                  │
    └──────────────────────────────────┘

I also think row could be html-likeified. It has a bunch of variations, one of which basically just exposes the Outline constructor.