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/src/SSLException.cpp

@@ -0,0 +1,30 @@
+//
+// SSLException.cpp
+//
+// Library: NetSSL_OpenSSL
+// Package: SSLCore
+// Module:  SSLException
+//
+// Copyright (c) 2006-2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/Net/SSLException.h"
+#include <typeinfo>
+
+
+namespace Poco {
+namespace Net {
+
+
+POCO_IMPLEMENT_EXCEPTION(SSLException, NetException, "SSL Exception")
+POCO_IMPLEMENT_EXCEPTION(SSLContextException, SSLException, "SSL context exception")
+POCO_IMPLEMENT_EXCEPTION(InvalidCertificateException, SSLException, "Invalid certficate")
+POCO_IMPLEMENT_EXCEPTION(CertificateValidationException, SSLException, "Certificate validation error")
+POCO_IMPLEMENT_EXCEPTION(SSLConnectionUnexpectedlyClosedException, SSLException, "SSL connection unexpectedly closed")
+
+
+} } // namespace Poco::Net