hotplug wmme: Change StopStream() timeout policy. For callback streams the maximum...

hotplug wmme: Change StopStream() timeout policy. For callback streams the maximum wait times have been tweaked. Total wait time has been reduced (Old algorithm wait time: [max(2*totalBuffersDur*1.5, 2*1second)], new algorithm wait time: [totalBuffersDur*1.5+min(totalBuffersDur*1.5, 1second)]). For blocking read write streams, the maximum wait time has been reduced to approximately totalBuffersDur*1.5. Added test patest_unplug_readwrite.c for testing stopping read/write streams after unplug. Tweaked patest_unplug.c to build on Windows, and to use 1 input channel (for headset). (Timeout changes made with reference to Jitsi [lyubomir a45b993, Thank you!].