Update build system

[jamescourtney]

• Use central package management
• Use Directory.build.props instead of common.props
• Tidy csproj files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.92%. Comparing base (1394a9e) to head (1f4742e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #431      +/-   ##
==========================================
- Coverage   96.95%   96.92%   -0.04%     
==========================================
  Files         126      126              
  Lines        9742     9742              
  Branches      788      788              
==========================================
- Hits         9445     9442       -3     
- Misses        208      210       +2     
- Partials       89       90       +1     

see 1 file with indirect coverage changes

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