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/PocoDoc/pages/samplePage.page

@@ -0,0 +1,39 @@
+This is a test page
+Category 1
+
+Poco::Util::AbstractConfiguration is an abstract base class for different
+kinds of configuration data, such as INI files, property files,
+XML configuration files or the Windows Registry.
+
+!!! Large Heading
+Configuration property keys have a hierarchical format, consisting
+of names separated by periods. The exact interpretation of key names
+is up to the actual subclass implementation of AbstractConfiguration.
+Keys are case sensitive. This is a link to somewhere else: http://www.appinf.com
+!! Medium Heading
+All public methods are synchronized, so the class is safe for multithreaded use.
+AbstractConfiguration implements reference counting based garbage collection.
+!Small Heading
+Subclasses must override the getRaw(), setRaw() and enumerate() methods.
+
+Here is some sample code:
+    int main(int argc, char** argv)
+    {
+    	std::cout << "Hello, world!" << std::endl;
+    	return 0;
+    }
+    
+!Another Paragraph
+Here we're -- showing <*italic text*>, <!bold text!> and <[teletype text]>.
+We can even do <*<!bold italic text!>*>!
+
+We can also refer to config properties: <? PocoDoc.software ?>
+
+And we can even include HTML:
+<%
+<p align="center">This is centered</p>
+%>
+...and <{<span style="font-weight: bold;">inline HTML</span>}>.
+And here is ordinary text, again.
+
+This is an [[http://www.appinf.com external link]].