Build products of art/Framework/IO/Root

Recurse build into art/Framework/IO/Root. Add CMake commands needed
to build, link and install products

- art_Framework_IO_RootVersion (lib)
- art_Framework_IO_Root (lib)
- art_Framework_IO_RootInput_source (plugin)
- art_Framework_IO_RootOutput_source (plugin)
- config_dumper (program)
- sam_metadata_dumper (program)

Add Tree to list of ROOT components that must be found. This is
required by the products.

Update README and dependencies files to record these products as
built.