D23306: Add AppStream metadata file

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: apol, mak, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Alternative to D23302 <https://phabricator.kde.org/D23302>. According to the AppStream documentation (https://www.freedesktop.org/software/appstream/docs/sect-Metadata-Application.html),
  adding an AppStream metadata file with multiple `launchable` tags will prevent AppStream
  info generators from parsing desktop files to determine metadata, which sbhould solve
  the problem of System Settings showing up twice in Discover and other software centers
  due to how it installs more than one `.desktop` file.

TEST PLAN
  Cannot test AppStream changes :/

REPOSITORY
  R124 System Settings

BRANCH
  add-appdata-file (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23306

AFFECTED FILES
  app/CMakeLists.txt
  app/org.kde.systemsettings.appdata.xml

To: ngraham, apol, mak, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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