Add positional DOP to GUI

[haslinghuis]

[HThuren]

Not sure what this will show ?
Look into firmware do not help.

[ctzsnooze]

@haslinghuis thank you very much! TESTED: It works great!

The only thing to consider is that in the UBlox documentation, the value they describe is 100 times smaller than what we use. For instance, a value of 220 in our code means a pDOP of 2.20 in UBLox terms.

The 'meaning' of 2.2 in UBLox terms is that the expected 3D accuracy should be within 2.2 times the specified accuracy of the module. If module accuracy is specified as +/- 1.5m, then we would expect accuracy within 2.2 * 1.5m.

Hence it would be nice to format the value 220 as 2.20, if possible. In the image below, 1.43.

[HThuren]

If this is right, do we have a value going from 0 to 5 ?
If so, we might reflect this understanding

https://portal.u-blox.com/s/question/0D52p00008HKDx1CAH/3d-acc-pdop-and-hdop

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[sonarcloud]

Quality Gate passed

Issues
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[github-actions]

Do you want to test this code? Here you have an automated build:
Betaflight-Configurator-Linux
Betaflight-Configurator-Android
Betaflight-Configurator-macOS
Betaflight-Configurator-Windows
WARNING: It may be unstable and result in corrupted configurations or data loss. Use only for testing!

[HThuren]

@haslinghuis my propsal was if value best shown as 'slider' from 0 to 5, just for better view (or I myself can try another day :-) )

[haslinghuis]

For now it displays the same PDOP value as the OSD. We are looking into other fields for better presentation.

This PR should be ready now.

[nerdCopter]

/100 makes more sense i suppose, but not a blocking factor for now.