added pipenv stuff, added celltemp and jsonl output

[sdellysse]

Added pipenv stuff for easier dev, added jsonl output, renamed test{i++} to unknown_{register}

also pulled in data from https://github.com/Grmume/renogy-smart-battery/issues/1 (thanks @epfenninger) and verified it against the data in my dc-home app via bt2 dongle

[Grmume]

Hi,

thank you for the input! I'm looking forward to integrate the features and improvements you have added.

I noticed some changes that prevented me from merging your pull request directly:

• The --list-devices option has been removed. I find this option useful to check which devices are available.
• Some command line options have been renamed --scan-addresses -> --find. I think scan-addresses conveys more clearly what the script will do (and that it will take some time)
• You have added the option to round each value during scaling from raw -> physical value. Was this added for a nicer output? If yes, then I would recommend adjusting the value just before printing so that the full resolution is always available for calculations.
• I think for the conversion to string it is easier to add a new register type and add characters based on the raw_values instead of first creating a very large integer and then using hexlify (see the updates I have just pushed)

I have just updated the code with the additional registers you and @epfenninger have discovered.