Support parameterized recipes

[sebastienros]

See https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-authoring-templates for an example. There are two important sections: parameters which describe the values that are expected, and how they should be provided (data type, validation, ...) and variables which are local expressions that can be reused in the json document.

A scenario would be to enhance the setup screen with these parameters, or to create recipes with dynamic logic like inject a guid automatically.

[sebastienros]

I implemented a very temporary solution to unblock my requirement, see IRecipeInterpreter. But it's extensible so some of it would be reusable when we decide to implement it correctly.

[agriffard]

Scipting modules and recipes implemented in #419.
Still needs documentation.

[sebastienros]

Thanks for the reminder 👍