Create a dashboard plugin to show dashboard boxes.

Also include add some fallback /admin routes.

If Dashboard plugin is not enabled -> Nodes index
If Dashboard and Nodes plugin is not enabled -> A empty page in the default Croogo plugin
Add a setupAdminDashboard event
Render dashboard boxes into two columns and a full width column
Trigger event before and after dashboard box render
Add dashboard table to save custom user dashboards
Show some feedback on collapsing a dashboard box
Allow custom sorting of dashboard boxes
Save dashboard box location to database
Load up saved dashboard positions
Some pretty styling when dragging boxes around
Use a easy to remember constant for each column
Add an example dashboard block.
Rename dashboard plugin to dashboards
Coding style: trailing commas for arrays