honor QUIET in find_package(ACTS) (was ACTS-125)

Original author Christian Gumpert @cgumpert

At the moment, the ACTSConfig.cmake file produces quite some output bout supported/loaded components regardless of the presence of the QUIET flag in the find_package call. The verbosity should be reduced if find_package(ACTS QUIET) is called.

Edited Mar 27, 2019 by Moritz Kiehn

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