move copyright to a common file

Nickolas Davisrequested to merge
(removed):consolidate_licenses into master

Moved all the copyright notices to a common file and used a common formatting. Followed examples set in VTK.

Additional changes:

  • Changed VTKmCheckCopyright.cmake to only print copyright mismatches for file one time
  • Changed MultiBackend.cxx to use a const reference catch (removes abiguous type warnings)
Edited by Nickolas Davis

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