Greater Flexibility pattern extraction from object argument in functions

[nirlipo]

Functions in the animation profile take as arguments as set of objects:

https://planimation.github.io/documentation/ap_guide/#distribution

From their string symbols, certain visual structures are parsed. See for example how the code of distribute_grid_around_point parses the object, or distributey does. This is an example using one of the functions.

It would be great to allow the specification of regex syntax to every animation function as an argument. We need to leave one regex formula by default. This will expose the semantics more clearly, and will give more flexibility for modelers who want to adapt the function interpretation over objects.