INDEX - Add Magnum - Draft recipe

[jgsogo]

Now this PR has become a place to track pending PRs for the magnum set of libraries.

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• [corrade] Add components + build_module + modernize #6290
• [vulkan-loader] Up requirements #6942
• [sdl] Add linux + enable nas + enable wayland #6387
• [nas] Network audio system #6388
• [corrade] Add components + build_module + modernize #6290
• [corrade][xbuild] Requires 'corrade-rc' while crossbuilding #6006
• [magnum] Add recipe #7095
• [magnum] Plugins can also be used as regular libraries #7358
• [magnum] handle shared_plugins=False, add test_package using ObjImporter plugin #7405

Required for magnum-integration:

• [dart] Draft recipe #6943
• [magnum-integration] Add recipe #7419

Also magnum-extras:

• [magnum-extras] Add recipe #7445
  • [magnum-plugins] Add recipe #7272

Emscripten

• https://github.com/werto87/conan-center-index/pull/2
• emsdk_installer init #6163
• [corrade] Build using emsdk #7410
• [magnum] Builds for emsdk #7412
• [magnum-plugins] Add recipe #7272

[SSE4]

there are conflicts - please rebase

[jgsogo]

there are conflicts - please rebase

This PR is not to be considered. Now it´s become an index for the other PRs

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This pull request has been automatically closed because it has not had recent activity. Thank you for your contributions.