MassConcentration: Add ounce per gallon units

[GianniDPC]

Add Ounce per gallon to Mass Concentration

[angularsen]

It's a good start!

Just a few more steps are required to complete this:
https://github.com/angularsen/UnitsNet/wiki/Adding-a-New-Unit

Specifically, you need to run generate-code.bat, implement the generated test case to fix the compile error and push these changes.

[angularsen]

I'm not familiar with these, but from google it seems this unit abbreviation is more widely used: oz/gal

If so, maybe instead of opg we could do oz/gal (U.S.) and oz/gal (imp.).

This is also consistent with gal (U.S.) and fluid ounce oz (U.S.) in Volume:

UnitsNet/Common/UnitDefinitions/Volume.json

Line 252 in c168b89

"Abbreviations": [ "gal (U.S.)" ]

UnitsNet/Common/UnitDefinitions/Volume.json

Line 268 in c168b89

"Abbreviations": [ "oz (U.S.)" ]

https://www.convert-me.com/en/convert/density/ozpgal.html?u=ozpgal&v=1
https://www.translatorscafe.com/unit-converter/en-US/density/17-33/gram/liter-ounce/gallon%20(US)/

[angularsen]

@GianniDPC Great, almost there. What remains is to implement the test case in https://github.com/GianniDPC/UnitsNet/blob/master/UnitsNet.Tests/CustomCode/MassConcentrationTests.cs, which now gives a compile error due to 2 missing properties.

Not your fault, but a lot of other files got changed in the PR. I cleaned this up now, so only the relevant files show up. It was due to a recent change in the codegen and your branch was behind on this change.

[GianniDPC]

Hope everything is OK now @angularsen :)

[angularsen]

@GianniDPC nuget on the way out
Release UnitsNet/4.98.0 · angularsen/UnitsNet