Add support for British units in OSD

[haslinghuis]

On slack there was a demand for a British unit for speed and distance related elements in OSD.
It's tested on a IFLIGHT SUCCEX-D F7 TWING with DJI goggles and this PR adds visibility in OSD preview.

Units

Unit	Speed	Distance
Imperial	MPH	Miles
Metric	KPH	KM
British	MPH	KM

Affected OSD Elements

OSD Element	Imperial	Metric	British
Altitude	Feet	Metre	Metre
GPS Speed	MPH	KPH	MPH
Home Distance	Feet	Metre	Metre
Numerical Vario	FTPS	MPS	MPS
Flight Distance	Feet	Metre	Metre
OSD Efficiency	Miles	KM	KM

Firmware part: betaflight/betaflight#10080

[haslinghuis]

Added Celsius / Fahrenheit to British unit.

[McGiverGim]

Fix the two Sonar issues, apart of this, the PR seems ok to me.

Maybe is better to start using the constants and not the position in the conditions, to make the code clearer. Is not needed for this PR, but I think it will left a better code.

[McGiverGim]

It seems good to me!!!

[McGiverGim]

It seems Travis is failing downloading the innosetup package... I will check to see if it is only Travis or is a general error... :(

[McGiverGim]

It seems only a Travis problem... the url https://registry.yarnpkg.com/@quanle94/innosetup/-/innosetup-6.0.2.tgz works perfectly for me.

I think is the URL that appears in the logs because is the first devDevpendency in the list:

betaflight-configurator/package.json

Lines 65 to 69 in 9edff49

	"devDependencies": {
	"@quanle94/innosetup": "^6.0.2",
	"chai": "^4.2.0",
	"command-exists": "^1.2.8",
	"cordova-lib": "^9.0.1",

[haslinghuis]

Now I am happy too. I missed two occasions. Fixed also. Including forgotten ; Also Travis is fine now too.

This is going bigger.... maybe is better to use several lines, one to select the unit and another one to return the string.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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0 Code Smells

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0.0% Duplication