D20758: kpackagetool: read kpackage-generic.desktop from qrc

[David Faure]

dfaure created this revision.
dfaure added reviewers: sitter, apol.
dfaure requested review of this revision.

TEST PLAN
  (to mimick CI) : make uninstall in kpackage and then
  QT_LOGGING_RULES='*=true' XDG_DATA_DIRS=$KDEDIR/share /d/kde/build/5/frameworks/kpackage/bin/kpackagetool5 --appstream-metainfo . --appstream-metainfo-output /tmp/a.xml
  
  For some reason kpackagetool5 creates a KPluginMetaData from
  metadata.desktop in 3 different places of the code
  (Package::setPath calls metadata() but then it deletes it!, metadata() again later, and PackageTool::showAppstreamInfo)
  
  Before: Unknown property type for key "X-Plasma-MainScript" -> falling back to string
  After: No more warning

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20758

AFFECTED FILES
  src/kpackagetool/kpackagetool.cpp

To: dfaure, sitter, apol
Cc: #frameworks
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