mmdevapi/tests: Perform renderer padding & position tests. (try2)

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

This testsuite has already proven useful at detecting a 64bit error.

I've also added comments about API behavior. I think the tests
are a better place than the code as they are less likely to
be removed by a rewrite of a component: old code gets nuked
and ignored, the tests remain.

I'm not satisfied with the lack of comments about important
things to know in winmm, DSound and mmdevapi.

Try2: I had badly merged the audible patch, revealing a new testcase:
RenderClient_ReleaseBuffer(flags=1) yields 80070057
which Wine does not follow. That's why the tests passed in Wine, not in testbot.

Regards,
	Jörg Höhle
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