create 'asset-edit-map' custom view about roundware-server

[13rac1]

Further details from @hburgund regarding the asset-map

Hopefully you can use this to devise a unit test so we get better coverage.
It’s really very simple and gets installed automatically. The file is here:

roundware/rw/templates/asset-map.html

and it can be accessed at:

http://localhost:8888/dashboard/asset-map?project=1

if you leave out the project_id parameter, it will include all projects.
Once you hit that url, you can move the pin for the default asset by dragging it and then check in the admin to see if the coordinates changed accordingly.

The ‘savePosition’ function does a PATCH AJAX call to handle the coordinate change, so that’s probably one of the tests you’ll want to add along with the drawPoints function that uses the assetlocation API endpoint to get the data for displaying the current state of the markers.

[hburgund]

#286 handles some nice updates here; some features listed above are still not incorporated, but will create new issues as needed since this one is large and a bit vague and is now quite stale.