Use a numeric unit for experimental sensors

Adds new experimental sensors to Zappi

Added experimental sensors to zappi to try and figure out what they are

Changes:

• Added two new sensors to the hub device: voltage_grid and frequency_grid
• Updated pymyenergi version

Changes:

• Changed units of power sensors from Wh to kWh
• Changed the term diverted to green (existing sensors will become stale, remove them manually)
• Added CT group power sensors (for 3 phase installs)

Bugfix: tried to access eddi ct's that don't exist

Changes:

• Fetch history data from local day start (previously it was UTC day start)

Bugfix, fixed eddi bug.
New since 0.0.6:
This release brings in energy sensors that are directly useable in the energy dashboard!
For the hub device the following sensors has been added:

grid import today
grid export today
energy generated today
energy diverted today
For eddi and zappi the following sensors has been added:

energy used today
energy diverted today
for each CT attached that are not set to None there will be an energy sensor created
About the energy today sensors and how they work:
Theses sensors are reset every midnight at 00:00 UTC. This will work fine with the energy dashboard, it will keep track of counter reset for long term statistics.

This release brings in energy sensors that are directly useable in the energy dashboard!
For the hub device the following sensors has been added:

• grid import today
• grid export today
• energy generated today
• energy diverted today

For eddi and zappi the following sensors has been added:

• energy used today
• energy diverted today
• for each CT attached that are not set to None there will be an energy sensor created

About the energy today sensors and how they work:
Theses sensors are reset every midnight at 00:00 UTC. This will work fine with the energy dashboard, it will keep track of counter reset for long term statistics.

Changes:

• Fixes a bug with eddi, status property was not defined (thanks @G6EJD )