phonon-backend-vlc-0.12.0

[Douglas R. Reno]

New minor version

Changes

    drop support for libvlc 2.x
    support qt5/6 multibuild
    mediaobject new can throw but does not return null
    .gitignore ignore /compile_commands.json
    Add Linux Qt 5 CI
    Update the translations folder name
    Remove explicit use of ECM_KDE_MODULE_DIR, is part of ECM_MODULE_PATH
    Make compile against qt6
    Add override keyword + use nullptr
    Show all headers in qtc6
    Adapt build system for building against qt6
    Use Qt::end
    Remove obsolete include
    Use override keyword
    Use QStringLiteral (QLAtin1String is deprecated)
    Use Q_SIGNALS/Q_SLOTS
    Fix typos found by codespell
    debug vmem format setup
    use picture_t to calculate pitch lines
    Update the obsolete projects.kde.org URL
    Revert “Port deprecated QLatin1Literal -> QLatin1String”
    Port deprecated QLatin1Literal -> QLatin1String
    preliminary vlc4 port
    only set xwindow when the qt platform actually is xcb (on unix)

[Bruce Dubbs]

Fixed at commits

3909fa1e6b Update to phonon-4.12.0.
bac7c05d12 Update to kuserfeedback-1.3.0. 
           Update to phonon-backend-vlc-0.12.0. 
           Archive phonon-backend-gstreamer.