Implement rich role.move interface

[LeoCx1000]

Summary

This PR is a continuation of #9853 and implements a rich Role.move interface to supersede role.edit(position=...), as it's unreliable because roles can have duplicated positions and holes in the ordering. #bikeshedding thread

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue. Technically?
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Rapptz]

This seems mostly okay I suppose.

The library uses single quotes instead of double quotes though.