Jedd's IFC improvements

[JR-Morgan]

• Extracting RenderMaterial now as RenderMaterialProxies
• Adjusted Mesh to use ReadOnlySpans rather than expecting callers to use unsafe pointers
• Added Testing2 project to upload directly to results Server

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 14.74%. Comparing base (00669ea) to head (00c2b22).
Report is 7 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##             dev     #510      +/-   ##
=========================================
+ Coverage   9.14%   14.74%   +5.59%     
=========================================
  Files        228      239      +11     
  Lines       4310     4674     +364     
  Branches     543      576      +33     
=========================================
+ Hits         394      689     +295     
- Misses      3900     3954      +54     
- Partials      16       31      +15     

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