Multiplatform CI build & test, +build tags: b_raylib,b_gtk

[stefanb]

Build on Linux and MacOS (windows build is failing since ever)

Installs needed CGO dependancies on both platforms for b_raylib and b_gtk build tags.

Done on top of #68, so check & merge that one first.

[refaktor]

I am thinking that we should maybe remove GTK and raylib for now. Ebitengine replaces raylib and GTK is too big to be properly supported in current stage. GTK was added more as a test to see if it can be integrated and how code would look.

I can go over all bindings see if there are any other that could be removed ot "archived" at this stage.

[stefanb]

The ebitengine currently fails during test, that's why I disabled the tag. See https://github.com/refaktor/rye/actions/runs/7240960768/job/19724539184

[refaktor]

Aha, I see ... I will try to see resolve that. And I will go and clean the modules list to something we can better support and handle at this point. Do you have any idea how to archive (remove but not lose) the modules that would be removed? Make archive repository ... just leave them in git history and tag it so we can find it later?

I've been working on new testing / docs engine and improving tests for few days now. I hope to commit it today, then I will do this purging.