Smartschool

* Bump minimal Python version to 3.11
* Setting the scripts executable.
* Fixing remote calls that needed the 'XMLHttpRequest' to be set.
* Adding `smartschool_report_on_future_tasks` to report on future tasks.

* Better caching mechanism
* Added MarkMessageUnread
* Added AdjustMessageLabel
* Added MessageMoveToArchive
* Added MessageMoveToTrash
* Added ResultDetails
* Renamed `SmartSchool` to `Smartschool`.
* Increased test coverage
* Code cleanup
* Added `smartschool_report_on_results` script to send emails about new results.

* Added fetching of 1 specific message and its attachments.

* Added StudentSupportLinks
* Added Messages

* Added AgendaMomentInfos
* Improved XML parsing
* Add a __lot__ of tests
* General cleanup of the code base

First commit