Ensure unit test process dies; Back ported non-threaded FakeMainLoop
from v2
#2756
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When using ReSharper's unit test explorer, it becomes obvious that the unit test process is not getting killed correctly.
The problem is the threads created in FakeMainLoop don't get cleaned up.
It turns out the thread created wasn't actually needed, so the fix is just to remove it. This not only simplifies the implementation but makes the unit tests much more reliable.