* 15min prices WIP
* WIP more changes for 15min prices
* More work on 15min pricing
* Fixed some errors
* Some changes after testing
* Graphical changes for 15min pricing
* Adjustments on MQTT handlers after switching to 15min prices
* Reverted some MQTT changes
* Adapted HA integration for 15min pricing
* Adapted JSON payload for 15min
* Adjustments during testing
* Set default price interval
* Fixed refresh of price graph when data changes
* Bugfixes
* Fixed some issues with raw payload
* Adjustments for meter timestamp from Kamstrup
* Updated readme
* Added detailed breakdown of payloads coming from Norwegian meters
* Minor changes relating to price
* Fixed byte alignment on price config
* Changes to support RC upgraders
