- Add each part of the search order in a separate method.
  - Collect added paths in an ivar in cmFindCommon.
  - Move user path storage up to cmFindCommon and share
    between cmFindBase and cmFindPackageCommand.
  - Expand user path registry values up in cmFindCommon
    - Enables 32-/64-bit registry view for find_package
    - Disables registry expansion for paths not specified
      with the PATHS argument, which is not expected.