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/include/Poco/UnWindows.h

@@ -0,0 +1,39 @@
+//
+// UnWindows.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  UnWindows
+//
+// Simple wrapper around the <windows.h> header file.
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_UnWindows_INCLUDED
+#define Foundation_UnWindows_INCLUDED
+
+
+// Reduce bloat
+#if defined(_WIN32)
+	#if !defined(WIN32_LEAN_AND_MEAN) && !defined(POCO_BLOATED_WIN32)
+		#define WIN32_LEAN_AND_MEAN
+	#endif
+#endif
+
+
+#if !defined(POCO_NO_WINDOWS_H)
+    #include <windows.h>
+    #ifdef __MINGW32__
+        #include <Winsock2.h>
+        #include <Iphlpapi.h>
+        #include <ws2tcpip.h>
+    #endif // __MINGW32__
+#endif
+
+
+#endif // Foundation_UnWindows_INCLUDED