UE Plugin: fix deadlock in FOptickPlugin::StopCapture #176
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Acquire UpdateCriticalSection lock each time coreLock is about to be locked to avoid deadlock
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This PR fixes an issue described here: #170
Optick::Update acquires coreLock and then tries to acquire UpdateCriticalSection lock if the capture has been stopped, while FOptickPlugin::OnEndFrameRT locks UpdateCriticalSection first and then tries to acquire coreLock, which results in a deadlock.
The proposed solution is to acquire UpdateCriticalSection lock each time coreLock is about to be acquired