Since pre-releases feed the marketplace content

- updates README
- minor updates to GL+ walkthrough intro

Also adds fast-forward option

- updates home GL+ banner
- updates graph account banners
- updates visual file history content

Adds "Copy" command to many items on the graph

- shows all account statuses
- removes preview badge

- updates verbiage for GL+ and GL Pro
- updates features section
- updates descriptions for GL+ features
- updates header link layout and styling

Co-authored-by: Eric Amodio <eamodio@gmail.com>

- updates plan names
- consolidates ensurePaidPlan functionality
- updates account quickpicks
- updates account notification messages

Co-authored-by: Eric Amodio <eamodio@gmail.com>

Co-authored-by: Eric Amodio <eamodio@users.noreply.github.com>

Avoids `as` casts
Removes unneeded imports

* Graph: double-click on a ref to check it out (similar to GKC)

* Renamed command type and function as requested in PR

* Removed cast to any

- Avoids polluting GitReference with graph specific data
 - Avoids Git tips ordering for proper group context
 - Reworks group context to merge with base context

- Hopefully ensures we will get build errors if the types change