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/SharedMemory_POSIX.h

@@ -0,0 +1,107 @@
+//
+// SharedMemoryImpl.h
+//
+// Library: Foundation
+// Package: Processes
+// Module:  SharedMemoryImpl
+//
+// Definition of the SharedMemoryImpl class.
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_SharedMemoryImpl_INCLUDED
+#define Foundation_SharedMemoryImpl_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/SharedMemory.h"
+#include "Poco/RefCountedObject.h"
+
+
+namespace Poco {
+
+
+class Foundation_API SharedMemoryImpl: public RefCountedObject
+	/// Shared memory implementation for POSIX platforms.
+{
+public:
+	SharedMemoryImpl(const std::string& name, std::size_t size, SharedMemory::AccessMode mode, const void* addrHint, bool server);
+		/// Creates or connects to a shared memory object with the given name.
+		///
+		/// For maximum portability, name should be a valid Unix filename and not
+		/// contain any slashes or backslashes.
+		///
+		/// An address hint can be passed to the system, specifying the desired
+		/// start address of the shared memory area. Whether the hint
+		/// is actually honored is, however, up to the system. Windows platform
+		/// will generally ignore the hint.
+		///
+		/// If server is set to false, the shared memory region will be unlinked
+		/// by calling shm_unlink when the SharedMemory object is destroyed.
+
+	SharedMemoryImpl(const Poco::File& file, SharedMemory::AccessMode mode, const void* addrHint);
+		/// Maps the entire contents of file into a shared memory segment.
+		///
+		/// An address hint can be passed to the system, specifying the desired
+		/// start address of the shared memory area. Whether the hint
+		/// is actually honored is, however, up to the system. Windows platform
+		/// will generally ignore the hint.
+
+	char* begin() const;
+		/// Returns the start address of the shared memory segment.
+
+	char* end() const;
+		/// Returns the one-past-end end address of the shared memory segment. 
+
+protected:
+	void map(const void* addrHint);
+		/// Maps the shared memory object.
+
+	void unmap();
+		/// Unmaps the shared memory object.
+
+	void close();
+		/// Releases the handle for the shared memory segment.
+
+	~SharedMemoryImpl();
+		/// Destroys the SharedMemoryImpl.
+
+private:
+	SharedMemoryImpl();
+	SharedMemoryImpl(const SharedMemoryImpl&);
+	SharedMemoryImpl& operator = (const SharedMemoryImpl&);
+
+	std::size_t _size;
+	int         _fd;
+	char*       _address;
+	SharedMemory::AccessMode _access;
+	std::string _name;
+	bool        _fileMapped;
+	bool        _server;
+};
+
+
+//
+// inlines
+//
+inline char* SharedMemoryImpl::begin() const
+{
+	return _address;
+}
+
+
+inline char* SharedMemoryImpl::end() const
+{
+	return _address + _size;
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_SharedMemoryImpl_INCLUDED