Expand definition of action success

[bollwyvl]

Elevator Pitch

Allow a task to declare return values other than the defaults to be considered "successful".

Motivation

Some CLI commands return exotic status codes to indicate failures that can be anticipated.

Some python functions return non-truthy/none values when successful.

Design Ideas

• create a new extension point, e.g. Passers
• add a simple, regular-expression based one for strings
• add a py one for user-defined ones
• if set, intercept the return values, and see if any of them match

# pyproject.toml
[tool.doitoml.tasks.rebot]
meta = { doitoml ={pass=["252"]}}
actions = [["rebot", "some/output.xml]]