[issue12915] Add inspect.locate and inspect.resolve

[Nick Coghlan]

Nick Coghlan added the comment:

Something to consider with these functions: it is probably desirable to also support the popular alternate notation which uses an explicit ":" to separate the module name from the reference within the module.

For example, setuptools entry points and nose test references both use that format.

The alternate notation should be fairly easy to both detect and handle through "name.partition(':')"

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nosy: +ncoghlan

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