PyAPI: Support for 'None' string args from Python

This is needed because some RNA functions differentiate a NULL 'char *'
argument from an empty string.

Previously a NULL argument could be passed when the C definition
defined the default as NULL and the argument wasn't passed
which is a fairly hidden way of handling things.

Now strings use `PROP_NEVER_NULL` by default
which can be cleared for function arguments that allow None -> NULL.

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