python: Extend SWIG gpgme_{sub,}key with a __repr__ method.

* lang/python/gpgme.i: Added a genericrepr macro and use it for
gpgme_key, gpgme_subkey, and gpgme_key_sig.
--

To look nicer in Python's REPL.

We define a generic __repr__ as a SWIG macro and use that to extend some
defined SWIG objects.

The alternative would have been to write a custom __repr__ function for
each class but that would need to be changed everytime the object's
structure changes. The bindings should be easy to maintain, I guess.
This comes at the expense that the reprs are now relatively long and
contain, for example, both keyid and fingerprint.

Signed-off-by: Tobias Mueller <[email protected]>

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