D27966: KParts: add PartLoader as replacement to KMimeTypeTrader for parts

[David Faure]

dfaure created this revision.
dfaure added reviewers: aacid, nicolasfella, kossebau.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
dfaure requested review of this revision.

REVISION SUMMARY
  It's based on the JSON metadata embedded into the plugins in kf5/parts/,
  but it also has fallback code using KMimeTypeTrader internally until
  KF6, so that we can start using PartLoader in applications.

TEST PLAN
  Tested with partviewer, see also next commit for unittest

REPOSITORY
  R306 KParts

REVISION DETAIL
  https://phabricator.kde.org/D27966

AFFECTED FILES
  src/CMakeLists.txt
  src/partloader.cpp
  src/partloader.h
  tests/partviewer.cpp

To: dfaure, aacid, nicolasfella, kossebau
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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