(Issue 209, 275) Make library truly header-only

[nrkramer]

Picking up from #224

A good pull request has the following information:

• A reference to a related issue in your repository.
  • Truly "header only" version #209
  • Remove zlib dependency #275
• A description of the changes proposed in the pull request.
  1. Remove dependency on generated files by checking-in include/CXXGraphConfig.h. This means any changes to version will change this file, however it makes the library truly header-only.
  2. Refractor how dependencies are fetched and included in the CMakeLists.txt for tests and benchmarking.
  3. Streamline how files are written/read in include/Graph/Graph.hpp. This sets us up for removing the dependency on compression in the distributable library.
  4. Remove compression from the header using a compiler define. Is this the cleanest way? Probably not. Could definitely be more clean by moving optional functions to a separate header. But this works for now.
• @mentions of the person or team responsible for reviewing proposed changes. ( optional )
  • @ZigRazor
  • @amerinor01 (optional)

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[nrkramer]

@ZigRazor I was unable to run tests on my setup because I don't use Mingw on my Windows machine. (As a side-note, using platform dependent stuff like rand_r is probably a bad idea: #277)

Would you mind running them for me? Feel free to push any fixes directly to this PR

[nrkramer]

Would also be nice to do a version bump to 1.0.1 after this is merged

[ZigRazor]

Some checks does not succed but is another problem on the repo, I will release a new version with this pull request