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/Version.h

@@ -0,0 +1,41 @@
+//
+// Version.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  Version
+//
+// Version information for the POCO C++ Libraries.
+//
+// Copyright (c) 2004-2016, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Version_INCLUDED
+#define Foundation_Version_INCLUDED
+
+
+//
+// Version Information
+//
+// Since 1.6.0, we're using Semantic Versioning 2.0
+// (http://semver.org/spec/v2.0.0.html)
+//
+// Version format is 0xAABBCCDD, where
+//    - AA is the major version number,
+//    - BB is the minor version number,
+//    - CC is the patch	version number, and
+//    - DD is the pre-release designation/number.
+//      The pre-release designation hex digits have a special meaning:
+//      00: final/stable releases
+//      Dx: development releases
+//      Ax: alpha releases
+//      Bx: beta releases
+//
+#define POCO_VERSION 0x010A0100
+
+
+#endif // Foundation_Version_INCLUDED