Sandbox for a higher-level OCaml-libMagick UI

The goal of this very early sandbox is to provide a higher-level UI for OCaml-libMagick, in order to be the engine of a futur ImageMagick GUI (graphical user interface).

First attempt with assoc-lists

Second attempt with different nodes types for each functions (this version is a further version made from the B1)
This version (B2) provides some functions to animate the parameters through the time,
here is an exemple of use.

The next step will be to implement the handling of the data structure.
A possible way to achieve this could perhaps be to use the Huet method.
Here is an early attempt to adapt it to Grinnm: