Partially Revert "scan-view: Remove Reporter.py and associated AppleScript files"

This reverts some of commit dbb01536.

The Reporter module was still being used by the ScanView.py module and deleting
it caused scan-view to fail.  This commit adds back Reporter.py but removes the
code the references the AppleScript files which were removed in
dbb01536.

Reviewed By: NoQ

Differential Revision: https://reviews.llvm.org/D96367