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/Crypto/src/KeyPair.cpp

@@ -0,0 +1,63 @@
+//
+// KeyPair.cpp
+//
+// Library: Crypto
+// Package: CryptoCore
+// Module:  KeyPair
+//
+// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/Crypto/KeyPair.h"
+#include <openssl/rsa.h>
+
+
+namespace Poco {
+namespace Crypto {
+
+
+KeyPair::KeyPair(KeyPairImpl::Ptr pKeyPairImpl):
+	_pImpl(pKeyPairImpl)
+{
+}
+
+
+KeyPair::KeyPair(const KeyPair& other):
+	_pImpl(other._pImpl)
+{
+}
+
+
+KeyPair::KeyPair(KeyPair&& other) noexcept:
+	_pImpl(std::move(other._pImpl))
+{
+}
+
+
+KeyPair::~KeyPair()
+{
+}
+
+
+KeyPair& KeyPair::operator = (const KeyPair& other)
+{
+	if (&other != this)
+	{
+		_pImpl = other._pImpl;
+	}
+	return *this;
+}
+
+
+KeyPair& KeyPair::operator = (KeyPair&& other) noexcept
+{
+	_pImpl = std::move(other._pImpl);
+	return *this;
+}
+
+
+} } // namespace Poco::Crypto