Bump SDK and enforce msbuild warnings

[JR-Morgan]

Changes:

• Bump CI to use SDK to 8.0.4xx
• Bump required SDK version to 8.0.4xx (not sure if we're happy to do this, will check with Alan first)
• Enforced msbuild warnings as errors in CI

Warning Fixes:

• Bumped Tekla nugets to 2022.1 (released 1 day after 2022.0, fixes a dependency graph conflict between their sdk nugets)
• Fixed Tekla platform targeting MSIL despite having x64 dependencies
• Weird IL repack warnings
• ArcGIS targets file containing unreachable code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 8.39%. Comparing base (34457ea) to head (b2dd869).

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #379   +/-   ##
=====================================
  Coverage   8.39%   8.39%           
=====================================
  Files        237     237           
  Lines       4691    4691           
  Branches     513     513           
=====================================
  Hits         394     394           
  Misses      4281    4281           
  Partials      16      16           

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[JR-Morgan]

Delay merge until end of week to avoid any friction with Specklecon