Use Shared props/targets

[JimBobSquarePants]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules :cop:.
• [x] I have provided test coverage for my change (where applicable)

Description

• Updates the solution to use the shared props/targets
• Cleans up all warnings in the solution.
• Adds Mac OSX CI workflow plus additional enhancements from ImageSharp.

[codecov[bot]]

Codecov Report

Merging #111 (f9b7929) into master (3d737b5) will increase coverage by 0.19%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   70.82%   71.01%   +0.19%     
==========================================
  Files          86       86              
  Lines        5600     5465     -135     
  Branches     1119     1119              
==========================================
- Hits         3966     3881      -85     
+ Misses       1409     1359      -50     
  Partials      225      225              

Flag	Coverage Δ
unittests	71.01% <ø> (+0.19%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rc/ImageSharp.Drawing/Shapes/RectangularPolygon.cs	88.19% <0.00%> (-0.55%)	:arrow_down:
src/ImageSharp.Drawing/Processing/SolidBrush.cs	92.10% <0.00%> (-0.40%)	:arrow_down:
src/ImageSharp.Drawing/Processing/PatternBrush.cs	85.41% <0.00%> (-0.30%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/Star.cs	92.30% <0.00%> (-0.29%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/ComplexPolygon.cs	74.78% <0.00%> (-0.22%)	:arrow_down:
...arp.Drawing/Shapes/Rasterization/ActiveEdgeList.cs	98.14% <0.00%> (-0.15%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/Clipper/clipper.cs	48.08% <0.00%> (-0.12%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/InternalPath.cs	90.22% <0.00%> (-0.11%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/Outliner.cs	95.40% <0.00%> (-0.11%)	:arrow_down:
src/ImageSharp.Drawing/Shapes/PathBuilder.cs	93.58% <0.00%> (-0.09%)	:arrow_down:
... and 6 more

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[JimBobSquarePants]

Didn't get to drawing yet, but I see 999 build warnings in main lib's ImageSharp.Test project per build target. We should fix that before propagating the changes further.

I don't think your submodule is loaded properly or something. I brought it down to zero from over 1200 warnings.

[antonfirsov]

@JimBobSquarePants ah sorry you may be right will doublecheck tomorrow! Forgot that sobmodule update typically goes always wrong 😅

[antonfirsov]

Opened SixLabors/ImageSharp#1460 to properly track the problem.