plugin calling code in main app

I need some help figuring out how a plugin can call code from classes 
defined in the main app

I have created a mockup project

   https://bitbucket.org/bettar/mockup/src/origin/

to show how far I got. Please clone the git repository and suggest the 
proper way for the plugin to use code (C++ classes) defined in the main app.

Alex Bettarini

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