Fix TGZ installer on Mac

[macumber]

Enhancement Request

Symlinks are created in the OpenStudioApplication/src/openstudio_app/install_operations.qs

We should cmake install that symlink instead of having it in the install_operations.qs so that the tar.gz installer works too.

See https://github.com/openstudiocoalition/OpenStudioApplication/pull/499

[jmarrec]

What would be great is also to have a functional OpenStudioApp inside the build folder. Currently I have to build a package everytime I want to test something, and that's annoying. Maybe we should fixup_bundle and co inside the build folder, and then try to just install everything when packaging, instead of delaying the fixup inside the package step (no sure if it's possible)