(!Beta only!) Improved discovery, new cache entities, new fan profile switching

Beta 2, details see here - please help with testing:

• ✅ improve device detection / auto-discovery (see discussions #164 and #171) → implemented and tested,
  
• ⚠️ include cache device info and cache disks (see discussion #161) → implemented, but not tested yet,
  
• ⚠️ include switching of cooling profiles / fan levels (see discussion #151) → implementation not done yet.