Fix Breaking Change Database Clean-Up in v15

Keywords: #EAV #Database

2sxc clean up some historical things in the DB which were obsolete:

1. ToSicEavAttributeGroups.SortOrder field was removed
2. ToSicEavEntities.SortOrder was removed
3. AttributeSet.Description was removed
4. ToSIC_EAV_DataTimeline.NewData was removed
5. Obsolete SQL-triggers which created data to the ToSIC_EAV_DataTimeline were removed

Note that the IContentType.Description in the API was also removed.