Add path API functions to GeneralResourceLocator

[johnwason]

This PR adds API functions to GeneralResourceLocator to add paths to the locator using a constructor overload or the new addPath() function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.00%. Comparing base (ea05dde) to head (b7de279).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1099      +/-   ##
==========================================
- Coverage   89.06%   89.00%   -0.06%     
==========================================
  Files         294      294              
  Lines       16449    16460      +11     
==========================================
  Hits        14651    14651              
- Misses       1798     1809      +11     

see 4 files with indirect coverage changes

[Levi-Armstrong]

It looks like you might need to squash everything and rebase before I can merge.

[Levi-Armstrong]

@johnwason It looks like the mac CI is failing.

[johnwason]

There is a new unrelated problem with bullet detection. It is something with the upstream vcpkg build. I will look at it in the next few days.