Apb ut visibility declarations

[alex-brinkman]

One possible way of overloading private and protected methods to enable fine-grained unit testing. Add a test package at test/fastcat_test_app that was used to confirm the fastcat library presents in the expected way to downstream applications.

Just bump minor version on these changes.

[alex-brinkman]

@kwehage I'm curious if you know of any better CMake pattern here.