Exchangelib

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- Removed the legacy autodiscover implementation.
- Added `QuerySet.depth()` to configure item traversal of querysets. Default is `Shallow` except for the `CommonViews`
folder where default is `Associated`.
- Updating credentials on `Account.protocol` after getting an `UnauthorizedError` now works.

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- The new Autodiscover implementation added in 2.2.0 is now default. To switch back to the old implementation, set the
environment variable `EXCHANGELIB_AUTODISCOVER_VERSION=legacy`.
- Removed support for Python 2

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- Added support for specifying a separate retry policy for the autodiscover service endpoint selection. Set via
the `exchangelib.autodiscover.legacy.INITIAL_RETRY_POLICY` module variable for the the old autodiscover
implementation, and via the
`exchangelib.autodiscover.Autodiscovery.INITIAL_RETRY_POLICY` class variable for the new one.
- Support the authorization code OAuth 2.0 grant type (see issue 698)
- Removed the `RootOfHierarchy.permission_set` field. It was causing too many failures in the wild.
- The full autodiscover response containing all contents of the reponse is now available as `Account.ad_response`.
- Added a new Autodiscover implementation that is closer to the specification and easier to debug. To switch to the new
implementation, set the environment variable `EXCHANGELIB_AUTODISCOVER_VERSION=new`. The old one is still the default
if the variable is not set, or set to `EXCHANGELIB_AUTODISCOVER_VERSION=legacy`.
- The `Item.mime_content` field was switched back from a string type to a `bytes` type. It turns out trying to decode
the data was an error (see issue 709).

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- Bugfix release.

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- Added support for OAuth 2.0 authentication
- Fixed a bug in `RelativeMonthlyPattern` and `RelativeYearlyPattern` where the `weekdays` field was thought to be a
list, but is in fact a single value. Renamed the field to `weekday` to reflect the change.
- Added support for archiving items to the archive mailbox, if the account has one.
- Added support for getting delegate information on an Account, as `Account.delegates`.
- Added support for the `ConvertId` service. Available as `Protocol.convert_ids()`.

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- Fixed a bug where version 2.x could not open autodiscover cache files generated by version 1.x packages.