Add MassFlux Units combinations for kilograms, centimeter/millimeters, hours

[trb5016]

Add units to MassFlux quantity so that there are now:

• g/s-m2
• g/s-cm2
• g/s-mm2
• kg/s-m2
• kg/s-cm2
• kg/s-mm2
• g/h-m2
• g/h-cm2
• g/h-mm2
• kg/h-m2
• kg/h-cm2
• kg/h-mm2

[angularsen]

@tmilnthorp @lipchev Any chance one of you can review this? I'm super busy the next few days.

[codecov-io]

Codecov Report

Merging #784 into master will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #784      +/-   ##
==========================================
+ Coverage   63.79%   63.87%   +0.08%     
==========================================
  Files         279      279              
  Lines       41544    41644     +100     
==========================================
+ Hits        26501    26601     +100     
  Misses      15043    15043              

Impacted Files	Coverage Δ
UnitsNet/GeneratedCode/UnitAbbreviationsCache.g.cs	100.00% <ø> (ø)
...ions/GeneratedCode/NumberToMassFluxExtensions.g.cs	100.00% <100.00%> (ø)
UnitsNet/GeneratedCode/Quantities/MassFlux.g.cs	58.68% <100.00%> (+10.29%)	⬆️
UnitsNet/GeneratedCode/UnitConverter.g.cs	100.00% <100.00%> (ø)

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[lipchev]

Verified the json- no remarks.
The calculations check out as well.

[angularsen]

Great! If it is convenient, could you please merge and bump version to release a new nuget too? If not I can get around to that later.

[lipchev]

@trb5016 It looks good- thank you. Just as a side note- I see that you are working on the same branch (trb5016:master) - this would eventually result in a rather long commit history. It is advisable, if possible, to delete your local branch after it has been merged. Alternatively there are ways to rebase onto master by just picking up some of the comments but I'm not exactly sure how this is supposed to be done...

[lipchev]

@angularsen I've created a draft release- please have a look, maybe it is because I didn't press the Publish release button, but the link to it still has this 'untagged' part that is worrying me a little (although I did create it 'From Tag' )

[angularsen]

@lipchev Can't access the link you gave, but I see the draft. It is perfectly safe for you to click publish, it looks good 👍

[lipchev]

UnitsNet/4.60.0 is out
PS The untagged part of the link now turned to tagged