Entities show tenths of a watt

[sfstar]

          > Feel free to report back if there are any issues or if it's working as intended

I've only used this to change the ESS grid setpoint, but it seems to work great for me. Thank you! The slider is handy, but it isn't nearly granular enough--in my case, it's in increments of 300W. If my finger moves even a bit while lifting, I could end up moving 3-4000W off target!

I think the ideal interface for ESS target would be something like my hot water heater, perhaps with a configuration option to specify the increment of 1, 10, 50, 100W. (the GX device moves in 10W increments, by the way)

Not to be nit-picky, but I did also notice that number.victron_settings_ess_acpowersetpoint2, number.victron_settings_ess_batterylife_minimumsoc, number.victron_settings_ess_maxfeedinpower (and perhaps others?) show a ".0" (tenths of watts) precision:

Originally posted by @randyoo in https://github.com/sfstar/hass-victron/issues/57#issuecomment-1544488831