BUG: Get MacOSX bundle version from Slicer_MAIN_PROJECT_VERSION_FULL

Michael Schumakerrequested to merge
github/fork/mschumak/Aug10-version-fix into master

Set MACOSX_BUNDLE_BUNDLE_NAME using Slicer_MAIN_PROJECT_VERSION_FULL, not Slicer_VERSION_FULL. Needed for custom applications.

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