fix(telemetry): process DSM LIPO Cells Monitor sensor correctly

[frankiearzu]

Fixes #4715

Summary of changes:

Fix processing of message 0x3A:

1. Create individual Cells Sensors (Cel1..Cel6)
2. Create Grouped "Cels" sensor who contains all the Cells. This is compatible with FrSky, and can be used as the source to compute the Min/Max Cell.

[pierrotm777]

Thanks you for your job :-)
Do i need to build a nightly firmware or can you build a firmware for a Tx16S please ?

[pfeerick]

To access the automatic builds for a PR, first open up the PR page. Under the PR title, you should see a series of tabs (Comments, Commits, Checks, Files Changed). Click on the Checks tab. Then if you are after the radio firmware, click on the link on the left side mentioning firmware. If you want a Companion/Simulator build, pick the one that suits your operating system. Then, under the 'Artifacts' heading near the bottom of the page will be a link to the zip file containing either the firmware or companion package.

[pierrotm777]

Sorry, i don't understand what is the PR page (too french :-).
Do you have a link ?
Thanks

[pierrotm777]

OOps PULL REQUEST ?

[pfeerick]

Sorry, yes, Pull Request. You are there/here already.

[pierrotm777]

Ok, i have found thanks

[frankiearzu]

@pfeerick don't merge it yet.. I think by fixing #4723 will allow to have temperatures using decimal places.
Looking at the code, many Telemetry protocols have Temperatures with Prec1, so better for do a fix that works for all (frsky, and other), and not just for Spektrum. I can remove just the temperature override to Prec0 in this fix.

[frankiearzu]

@pfeerick DONE.. Checked in the fix for the temperature UNIT conversion in another PR. #4728