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/JSONString.h

@@ -0,0 +1,93 @@
+//
+// JSONString.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  String
+//
+// JSONString utility functions.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_JSONString_INCLUDED
+#define Foundation_JSONString_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+namespace Poco {
+
+
+enum JSONOptions
+{
+	JSON_PRESERVE_KEY_ORDER = 1,
+		/// Applies to JSON::Object. If specified, the Object will
+		/// preserve the items insertion order. Otherwise, items
+		/// will be sorted by keys.
+		///
+		/// Has no effect on toJSON() function.
+
+	JSON_ESCAPE_UNICODE = 2,
+		/// If specified, when the object is stringified, all
+		/// unicode characters will be escaped in the resulting
+		/// string.
+
+	JSON_WRAP_STRINGS = 4
+		/// If specified, the object will preserve the items
+		/// insertion order. Otherwise, items will be sorted
+		/// by keys.
+};
+
+
+//@ deprecated
+void Foundation_API toJSON(const std::string& value, std::ostream& out, bool wrap = true);
+	/// Formats string value into the supplied output stream by
+	/// escaping control and ALL Unicode characters.
+	/// If wrap is true, the resulting string is enclosed in double quotes.
+	///
+	/// This function is deprecated, please use
+	///
+	/// void Poco::toJSON(const std::string&, std::ostream&, int)
+
+
+//@ deprecated
+std::string Foundation_API toJSON(const std::string& value, bool wrap = true);
+	/// Formats string value by escaping control and ALL Unicode characters.
+	/// If wrap is true, the resulting string is enclosed in double quotes
+	///
+	/// Returns formatted string.
+	///
+	/// This function is deprecated, please use
+	///
+	/// std::string Poco::toJSON(const std::string&, int)
+
+
+void Foundation_API toJSON(const std::string& value, std::ostream& out, int options);
+	/// Formats string value into the supplied output stream by
+	/// escaping control characters.
+	/// If JSON_WRAP_STRINGS is in options, the resulting strings is enclosed in double quotes
+	/// If JSON_ESCAPE_UNICODE is in options, all unicode characters will be escaped, otherwise
+	/// only the compulsory ones.
+
+
+std::string Foundation_API toJSON(const std::string& value, int options);
+	/// Formats string value by escaping control characters.
+	/// If JSON_WRAP_STRINGS is in options, the resulting string is enclosed in double quotes
+	/// If JSON_ESCAPE_UNICODE is in options, all unicode characters will be escaped, otherwise
+	/// only the compulsory ones.
+	///
+	/// Returns formatted string.
+	/// If escapeAllUnicode is true, all unicode characters will be escaped, otherwise only the compulsory ones.
+
+
+
+} // namespace Poco
+
+
+#endif // Foundation_JSONString_INCLUDED