Also provide a utility function to get this path, and
a way to override at run time to quickly sub in alternative
data.
The test itself is still broken, as this plugin won't accept
a call to Load() without a KiWay.
Redesignate the eagle test as eeschema tests and build
more like the other unit tests.
Enable as a test in Ctest now that the test executes without
crashing.
The loading of the file with the hardocded part is still
not enabled, as this needs more infrastructure to support it.