In the scaffolder, handle application and endpoint names with Python module-unfriendly characters like hyphens

[aholmes]

Using hyphens, spaces, etc. in the arguments for endpoint names or the application name when using bl-python-scaffold will cause invalid Python modules to generate. This PR fixes the problems by normalizing the names:

• Module names have the invalid characters replaced with _, including space
• URLs are lowercased but otherwise untouched

This PR adds a new argparse module to BL_Python.programming with the following functionality:

• DisallowDuplicateValues is an argparse Action used to prevent repeated arguments from containing the same values
• associate_disallow_duplicate_values is an argparse Action that behaves the same as DisallowDuplicateValues, but associates the argument with another argument's value
• disallow allows argparse to error when an argument is in a list of values

Closes #38
Closes #41

[aholmes]

Connexion 3.0.6 contains a breaking change from 3.0.5, causing the tests to fail. I'm looking into it.

[nwiltsie]

The new argparse types are pretty sneaky - I like it!

[aholmes]

@nwiltsie

The new argparse types are pretty sneaky - I like it!

I will be making a new BL_Python.programming release sometime soon, so they can be used elsewhere.

I should note I'm not particularly happy with the names. Any suggestions?

[aholmes]

Connexion 3.0.6 contains a breaking change from 3.0.5, causing the tests to fail. I'm looking into it.

The issue is a breaking change in Starlette 0.35.0 from PR encode/starlette#2377. It turns out Starlette returning a host:port is not required by the ASGI spec, so it was decided to instead return None rather than fake values. I'll be committing a fix shortly.