D20967: [UserMetaData] Add method to query which attributes are set

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, astippich, ngraham.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  Many files have no UserMetaData attributes set at all, or only a subset
  of the available ones. Allow to bulk query which attributes are set to
  short cut the one-by-one query.

TEST PLAN
  ctest (on Linux)
  
  Code paths for Mac and FreeBSD are fully implemented, but untested. The
  Windows implementation is mostly a stub, but functional conforming with
  the documentation.

REPOSITORY
  R286 KFileMetaData

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20967

AFFECTED FILES
  autotests/usermetadatawritertest.cpp
  src/usermetadata.cpp
  src/usermetadata.h
  src/xattr_p.h

To: bruns, #baloo, #frameworks, astippich, ngraham
Cc: kde-frameworks-devel, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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