AreaDensity: Add g/m2, mg/m2, add operators

[Brunni]

Fixes #1131

[codecov[bot]]

Codecov Report

Merging #1134 (8a9398a) into master (77b1ef2) will increase coverage by 0%. The diff coverage is 80%.

:exclamation: Current head 8a9398a differs from pull request most recent head 39f271e. Consider uploading reports for the commit 39f271e to get more accurate results

@@          Coverage Diff           @@
##           master   #1134   +/-   ##
======================================
  Coverage      85%     85%           
======================================
  Files         322     323    +1     
  Lines       52322   52353   +31     
======================================
+ Hits        44894   44929   +35     
+ Misses       7428    7424    -4     

Impacted Files	Coverage Δ
...nitsNet/CustomCode/Quantities/AreaDensity.extra.cs	0% <0%> (ø)
UnitsNet/CustomCode/Quantities/Mass.extra.cs	89% <50%> (-5%)	:arrow_down:
...s/GeneratedCode/NumberToAreaDensityExtensions.g.cs	100% <100%> (ø)
UnitsNet/GeneratedCode/Quantities/AreaDensity.g.cs	82% <100%> (+4%)	:arrow_up:

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[Brunni]

The build reached maximum of 60 Minutes. Can someone restart it?

EDIT: Build seems to be normally at 58 Minutes. This is quite long. How does it come?

[angularsen]

Sorry for the late reply, I have been missing out on email notifications for some time.

Will review soon.

[angularsen]

The build reached maximum of 60 Minutes. Can someone restart it?

EDIT: Build seems to be normally at 58 Minutes. This is quite long. How does it come?

I have no idea, sometimes the vstest process seems to hang on AppVeyor. Other times, it is just slow. It is nowhere near as slow locally, I guess the free open source VMs have very limited capacity. In the old days it took 4-5 minutes on AppVeyor, so something has definitely changed over time.

[angularsen]

Release UnitsNet/4.147.0 · angularsen/UnitsNet

[angularsen]

I tried upgrading a very outdated JetBrains' dotcover tool to hopefully fix the hang/slow builds. It seems to help locally at least. 🤞 #1146