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/NetSSL_OpenSSL/include/Poco/Net/SecureServerSocketImpl.h

@@ -0,0 +1,150 @@
+//
+// SecureServerSocketImpl.h
+//
+// Library: NetSSL_OpenSSL
+// Package: SSLSockets
+// Module:  SecureServerSocketImpl
+//
+// Definition of the SecureServerSocketImpl class.
+//
+// Copyright (c) 2006-2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef NetSSL_SecureServerSocketImpl_INCLUDED
+#define NetSSL_SecureServerSocketImpl_INCLUDED
+
+
+#include "Poco/Net/NetSSL.h"
+#include "Poco/Net/SecureSocketImpl.h"
+#include "Poco/Net/ServerSocketImpl.h"
+#include "Poco/Net/Context.h"
+
+
+namespace Poco {
+namespace Net {
+
+
+class NetSSL_API SecureServerSocketImpl: public ServerSocketImpl
+	/// The SocketImpl class for SecureServerSocket.
+{
+public:
+	SecureServerSocketImpl(Context::Ptr pContext);
+		/// Creates the SecureServerSocketImpl using the
+		/// given SSL context object.
+
+	SocketImpl* acceptConnection(SocketAddress& clientAddr);
+		/// Get the next completed connection from the
+		/// socket's completed connection queue.
+		///
+		/// If the queue is empty, waits until a connection
+		/// request completes.
+		///
+		/// Returns a new TCP socket for the connection
+		/// with the client.
+		///
+		/// The client socket's address is returned in clientAddr.
+	
+	void connect(const SocketAddress& address);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+
+	void connect(const SocketAddress& address, const Poco::Timespan& timeout);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+
+	void connectNB(const SocketAddress& address);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+	
+	void bind(const SocketAddress& address, bool reuseAddress = false, bool reusePort = false);
+		/// Bind a local address to the socket.
+		///
+		/// This is usually only done when establishing a server
+		/// socket. TCP clients should not bind a socket to a
+		/// specific address.
+		///
+		/// If reuseAddress is true, sets the SO_REUSEADDR
+		/// socket option.
+		///
+		/// If reusePort is true, sets the SO_REUSEPORT
+		/// socket option.
+
+		
+	void listen(int backlog = 64);
+		/// Puts the socket into listening state.
+		///
+		/// The socket becomes a passive socket that
+		/// can accept incoming connection requests.
+		///
+		/// The backlog argument specifies the maximum
+		/// number of connections that can be queued
+		/// for this socket.
+
+	void close();
+		/// Close the socket.
+	
+	int sendBytes(const void* buffer, int length, int flags = 0);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+	
+	int receiveBytes(void* buffer, int length, int flags = 0);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+	
+	int sendTo(const void* buffer, int length, const SocketAddress& address, int flags = 0);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+	
+	int receiveFrom(void* buffer, int length, SocketAddress& address, int flags = 0);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+	
+	void sendUrgent(unsigned char data);
+		/// Not supported by this kind of socket.
+		///
+		/// Throws a Poco::InvalidAccessException.
+
+	bool secure() const;
+		/// Returns true iff the socket's connection is secure
+		/// (using SSL or TLS).
+		
+	Context::Ptr context() const;
+		/// Returns the SSL context used by this socket.
+
+protected:
+	~SecureServerSocketImpl();
+		/// Destroys the SecureServerSocketImpl.
+
+private:
+	SecureServerSocketImpl(const SecureServerSocketImpl&);
+	SecureServerSocketImpl& operator = (const SecureServerSocketImpl&);
+
+private:
+	SecureSocketImpl _impl;
+};
+
+
+//
+// inlines
+//
+inline Context::Ptr SecureServerSocketImpl::context() const
+{
+	return _impl.context();
+}
+
+
+} } // namespace Poco::Net
+
+
+#endif // NetSSL_SecureServerSocketImpl_INCLUDED