CMake Build + GitHub CI Automated Builds

[zombraxi]

• Implements a CMake Build with the option to fetch and build third party dependencies on demand rather than utilize statically built libraries which reside in the repository.

• Implements Automated Builds via GitHub CI (Continuous Integration). You can enable this for your project by visiting the Actions tab for the repository and enabling.

• Updates the README with information on how to compile the project yourself with CMake

• Updates the Visual Studio project for DivaModLoader to utilize the new Include directory which was created to isolate third-party dependencies in Dependencies.

Build/compilation succeeds in GitHub CI, so it is a safe merge. Try it yourself if you'd like.

[zombraxi]

Closing. Will open a new one shortly with the CI only.