[host] made DXGI ReInitialization more robust on mode changes

DXGI doesn't like to restart too fast, com exceptions are logged and the
duplication device fails to create with an E_ACCESS_DENIED error. Adding
a 200ms sleep between teardown and re-init resolves this issue.

host/Capture/DXGI.h

@@ -42,6 +42,8 @@ namespace Capture
     bool GrabFrame(struct FrameInfo & frame);
 
   private:
+    bool ReInitialize();
+
     bool          m_initialized;
     MTMemcpy      m_memcpy;
     unsigned int  m_width;