[somfycul] New Binding

[Nookyx]

I'm planning on adding a binding for the somfy RTS rollershutters via CUL devices (e.g. nanoCUL).
Opening the feature request here as per contribution guidelines.

This will be based off the initial work done by Daniel Weisser back then with the somfycul binding (he never released it officially).

I have asked the original author (Daniel Weisser) in the community forum for permissions to further develop his addon, and he agreed to it.

When adapting the addon, I'll also try to fix the gnu.io dependency issue.