Here's a quick and dirty way of testing for plugins:
If you haven't already, save your game as a Project. Open the .caproj in a text editor and look for the section at the top that looks like:
<used-plugins>
<plugin id="Button" version="1">Button</plugin>
<plugin id="Mouse" version="1">Mouse</plugin>
<plugin id="Keyboard" version="1">Keyboard</plugin>
<plugin id="Text" version="1">Text</plugin>
<plugin id="wastrel_or" version="1">OR</plugin>
</used-plugins>
As you can see from this example, there is a definite 3rd-party plugin (wastrel_or).