Remove dependencies on Boost.StaticAssert

[Lastique]

Boost.StaticAssert has been merged into Boost.Config, so remove the dependency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (651e7e8) to head (804ad63).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #287   +/-   ##
========================================
  Coverage    94.84%   94.84%           
========================================
  Files           73       73           
  Lines         8986     8986           
========================================
  Hits          8523     8523           
  Misses         463      463           

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[mborland]

Thanks again for doing all of these