Merge collections and sets

The rough timeline I can forsee:

  1. Ability to change default type for collections and sets by relation (start of Q4)
  2. More robust sets querying (end of Q4)
  3. More powerful search functions (first half of 2024 depending on other things)
  4. Some things towards the sets being part of the search (Somewhere in 2024 hard to say, it is roughly a priority or smth)