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/AtomicCounter.h

@@ -0,0 +1,133 @@
+//
+// AtomicCounter.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  AtomicCounter
+//
+// Definition of the AtomicCounter class.
+//
+// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_AtomicCounter_INCLUDED
+#define Foundation_AtomicCounter_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include <atomic>
+
+
+namespace Poco {
+
+
+class Foundation_API AtomicCounter
+	/// This class implements a simple counter, which
+	/// provides atomic operations that are safe to
+	/// use in a multithreaded environment.
+	///
+	/// Typical usage of AtomicCounter is for implementing
+	/// reference counting and similar functionality.
+{
+public:
+	typedef int ValueType; /// The underlying integer type.
+
+	AtomicCounter();
+		/// Creates a new AtomicCounter and initializes it to zero.
+
+	explicit AtomicCounter(ValueType initialValue);
+		/// Creates a new AtomicCounter and initializes it with
+		/// the given value.
+
+	AtomicCounter(const AtomicCounter& counter);
+		/// Creates the counter by copying another one.
+
+	~AtomicCounter();
+		/// Destroys the AtomicCounter.
+
+	AtomicCounter& operator = (const AtomicCounter& counter);
+		/// Assigns the value of another AtomicCounter.
+
+	AtomicCounter& operator = (ValueType value);
+		/// Assigns a value to the counter.
+
+	operator ValueType () const;
+		/// Converts the AtomicCounter to ValueType.
+
+	ValueType value() const;
+		/// Returns the value of the counter.
+
+	ValueType operator ++ (); // prefix
+		/// Increments the counter and returns the result.
+
+	ValueType operator ++ (int); // postfix
+		/// Increments the counter and returns the previous value.
+
+	ValueType operator -- (); // prefix
+		/// Decrements the counter and returns the result.
+
+	ValueType operator -- (int); // postfix
+		/// Decrements the counter and returns the previous value.
+
+	bool operator ! () const;
+		/// Returns true if the counter is zero, false otherwise.
+
+private:
+	std::atomic<int> _counter;
+};
+
+
+//
+// inlines
+//
+
+inline AtomicCounter::operator AtomicCounter::ValueType () const
+{
+	return _counter.load();
+}
+
+
+inline AtomicCounter::ValueType AtomicCounter::value() const
+{
+	return _counter.load();
+}
+
+
+inline AtomicCounter::ValueType AtomicCounter::operator ++ () // prefix
+{
+	return ++_counter;
+}
+
+
+inline AtomicCounter::ValueType AtomicCounter::operator ++ (int) // postfix
+{
+	return _counter++;
+}
+
+
+inline AtomicCounter::ValueType AtomicCounter::operator -- () // prefix
+{
+	return --_counter;
+}
+
+
+inline AtomicCounter::ValueType AtomicCounter::operator -- (int) // postfix
+{
+	return _counter--;
+}
+
+
+inline bool AtomicCounter::operator ! () const
+{
+	return _counter.load() == 0;
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_AtomicCounter_INCLUDED