I have a case where I want one of the plugins I load to be able to communicate with another plugin. I can see how the OSMF team has done it with the control bar plugin example. But say I wanted the control bar to communicate with another plugin, could I use Metadata to hold key value pairs so each plugin has access to the data? I'm having difficulting getting the reference or bridge set up. Any suggestions or examples where a plugin is actually communicating with another plugin not just with the player?