Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Foundation/samples/ActiveMethod/src/ActiveMethod.cpp

@@ -0,0 +1,56 @@
+//
+// ActiveMethod.cpp
+//
+// This sample demonstrates the ActiveMethod and ActiveResult classes.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/ActiveMethod.h"
+#include "Poco/ActiveResult.h"
+#include <iostream>
+
+
+using Poco::ActiveMethod;
+using Poco::ActiveResult;
+
+
+class ActiveMethodExample
+{
+public:
+	struct AddArgs
+	{
+		int a;
+		int b;
+	};
+	
+	ActiveMethodExample():
+		activeAdd(this, &ActiveMethodExample::activeAddImp)
+	{
+	}
+	
+	ActiveMethod<int, AddArgs, ActiveMethodExample> activeAdd;
+	
+private:
+	int activeAddImp(const AddArgs& args)
+	{
+		return args.a + args.b;
+	}
+};
+
+
+int main(int argc, char** argv)
+{
+	ActiveMethodExample example;
+	
+	ActiveMethodExample::AddArgs args = {1, 2};
+	ActiveResult<int> result = example.activeAdd(args);
+	result.wait();
+	std::cout << result.data() << std::endl;
+	
+	return 0;
+}