This adds support for the client credential flow oauth method which
requires some special handling in onedrive:
- Special scopes are required
- The tenant is required
- The tenant needs to be used in the oauth URLs
This also:
- refactors the oauth config creation so it isn't duplicated
- defaults the drive_id to the previous one in the config
- updates the documentation
Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
Martin HassackandNick Craig-Wood
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