Creating C++ OOT with gr-modtool

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TODO: intro material

The previous tutorial, Creating Python OOT with gr-modtool, describes how to create a Python block in an OOT module. This c++ OOT tutorial builds upon the previous Python one, so it is is suggested to at least complete the Installation Note and Creating an OOT Module portions of that tutorial before completing this one.

TODO: pick up from python OOT tutorial

TODO: link back to python tutorial