AsyncLoop: Add auto-incrementing & completion testing methods

These basically make it almost impossible to commit errors in async
loop logic implementation.

include/asynchronousLoop.h

@@ -18,6 +18,20 @@ public:
 		return nSucceeded + nFailed == nTotal;
 	}
 
+	void incrementSuccessOrFailureDueTo(bool success)
+	{
+		if (success)
+			{ ++nSucceeded; }
+		else
+			{ ++nFailed; }
+	}
+
+	bool incrementSuccessOrFailureAndTestForCompletionDueTo(bool success)
+	{
+		incrementSuccessOrFailureDueTo(success);
+		return isComplete();
+	}
+
 public:
 	std::atomic<unsigned int> nTotal, nSucceeded, nFailed;
 };