Create a function existence registry

With the signature module, it is now a straight forward task
to generate a registry of all known function signatures.
We check that these signatures all exist.

One file contains all signatures for one platform and version.

The test is only activated when run in the CI system.
An initial call creates the expected file as output and raises
an error. The result can then be picked up from the error log
and added to the repository.

Done: linux2 5.6.4
Done: darwin 5.6.4
Done: win32 5.6.4
Done: darwin 5.9.3
Done: linux2 5.9.3

Task-number: PYSIDE-510
Change-Id: I00cc1a4854a8149a40659c04d81ffd3e6db64bc8
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

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