Add the UUID functions to the database classes
Adjust the `Dbafs` class
Set up the version 3.2 update
Adjust the content elements so the use the UUID instead of the numeric ID
Make the file picker use the UUIDs
Adjust the SQL field definitions in the DCAs
Replace the remaining `findByPk()` calls with `findByUuid()`
Replace the remaining `findMultipleByIds()` calls with `findMultipleByUuids()`
Correctly order by the order fields
Adjust the database update (tested with version 2.11, 3.0 and 3.1)
Adjust the demo website to the new file UUIDs
Merge branch 'feature/file-system-uuids' into develop (see #5757)