* Fix formatting in history test
* Add each sensor as own template
* Make adapters non-entities
* Externalize and organize data fetching, improve system view
* Small fixes
Rename fetching adapters to adapters
throw away non-working system overviews
slightly change naming
remove scan_interval from schema
formatting
* Scan interval is already timedelta and unnecessary return
* Formatting
* Ensure better codestyle by storing cell variables explicitely in different places