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/Debugger.h

@@ -0,0 +1,70 @@
+//
+// Debugger.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  Debugger
+//
+// Definition of the Debugger class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Debugger_INCLUDED
+#define Foundation_Debugger_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+namespace Poco {
+
+
+class Foundation_API Debugger
+	/// The Debugger class provides an interface to the debugger.
+	/// The presence of a debugger can be checked for,
+	/// messages can be written to the debugger's log window
+	/// and a break into the debugger can be enforced.
+	/// The methods only work if the program is compiled
+	/// in debug mode (the macro _DEBUG is defined).
+{
+public:
+	static bool isAvailable();
+		/// Returns true if a debugger is available, false otherwise.
+		/// On Windows, this function uses the IsDebuggerPresent()
+		/// function.
+		/// On Unix, this function returns true if the environment
+		/// variable POCO_ENABLE_DEBUGGER is set.
+
+	static void message(const std::string& msg);
+		/// Writes a message to the debugger log, if available, otherwise to
+		/// standard error output.
+
+	static void message(const std::string& msg, const char* file, int line);
+		/// Writes a message to the debugger log, if available, otherwise to
+		/// standard error output.
+
+	static void enter();
+		/// Breaks into the debugger, if it is available.
+		/// On Windows, this is done using the DebugBreak() function.
+		/// On Unix, the SIGINT signal is raised.
+
+	static void enter(const std::string& msg);
+		/// Writes a debug message to the debugger log and breaks into it.
+
+	static void enter(const std::string& msg, const char* file, int line);
+		/// Writes a debug message to the debugger log and breaks into it.
+
+	static void enter(const char* file, int line);
+		/// Writes a debug message to the debugger log and breaks into it.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Debugger_INCLUDED