v2.0.2-hlx

Fix the GenFit CMakeLists.txt and macros to work better as an included library

This release version syncs us back up with the release taggin in place upstream. As of today, the latest release there is 02-00-02, which does NOT match the release in the CMakeLists.txt, which is still 2.2.0, and which was the reason we tagged our releases at 2.2.0 prior to this.

In any case, this release should match upstream's 02-00-02, except for some minor changes to the top CMakeLists.txt, including an update to the project version strings (e.g., ${PROJECT_NAME}_VERSION_MAJOR) to match the actual release.