Port to MacOS

[booxter]

• flake.lock: update nix inputs
• darwin: fix OpenGL includes and linker flags
• flake: make dependencies platform-aware for Darwin
• flake: modernize metadata and output attrs
• flake: remove rec from outputs
• flake: use postPatch for prefix substitution
• flake: rely on cmake hooks for build and install
• flake: narrow with-pkgs scope to dependency lists
• flake: add formatter output
• darwin: use GLUT framework instead of freeglut

[arf20]

Hi! Thanks for the PR, since I don't own a Mac system, I can't properly test this, but I can test there is no regression on the Linux build.

Excuse the terrible code, this project is quite old xD I would not use GLUT and the OpenGL FFP now, I would rewrite this in OpenGL 3.3 and migrate to GLFW if I had the time.

[booxter]

FWIW I can start the app, control it with key bindings etc. I can attach screenshots later to confirm it works if needed. Let me know.

[arf20]

Alright, LGTM.

BTW there are memory safety issues with libcurlpp, after merging this I will be removing the libcurlpp dependency in favour of plain libcurl.