Mind: Use state variables to manage shutdown

We now allow the shutdown*Req() methods of Mind:: to return early
if their aspect of the object in question hasn't actually been
initialized.

smocore/include/mind.h

@@ -73,7 +73,8 @@ private:
 	 * This flag ensures that JOLTing happens exactly once and provides
 	 * a synchronization point for the entire system initialization.
 	 */
-	bool threadsHaveBeenJolted = false;
+	bool threadsHaveBeenJolted = false,
+		bodyComponentInitialized = false;
 	// Collection of ComponentThread instances (excluding marionette)
 	std::vector<std::shared_ptr<ComponentThread>> componentThreads;