Feature: Easy enable/disable PV/SG on Heat pumps

[proddy]

In reference to #1678 (reply in thread) and #1600

[MichaelDvP]

I think the input configuration is a one time task. Once configured the user may want to switch the input (invert), this is n´only a write 0/1 (off/on, false/true) to the config entity, no need for a long string.
If someone really want to configure often, mybe the PV byte, he can look into the list of #1600 (comment) and create a custom entity for PV1 0x486, offset 39, UINT8.

[proddy]

Ok. This was an idea from @bbqkees so I'll wait until we have clear requirements.