Omnikdatalogger

- last_update for solar data is updated too with DSMR updates
- improvement in the way the cached data of multiple inverters is processed with DSMR data updates.
> pypi build (pip) is v1.6.14 but is the same code.

- v1.6.13
The `last_update` updates even when there is no update form the inverter. This update caches `last_update` and returns that value if no recent update is available during net updates.

- Fix incorrect consumption calculation (pvoutput)

- Fix condition to reset `last_reset` the first time

- Reset cache for current_power and today_energy after midnight local time