Update for changes in core.
Use aud_drct_* instead of aud_playlist_* where appropriate.
qtui: Mark string as translatable.
qtui: More translation fixes.
Header fixups.
qtui: switch menubar ownership to libaudqt (partial)
qtui: port playback menu
oss4: Fix compiler warning of Clang.
qtui: port over the rest of the menus
qtui: begin removing Qt Designer vestiges
qtui: remove ui_main_window.h dependency from build
qtui: remove qt designer files
qtui: Fix build on Linux.
qtui: Fix translations in menu bar.
Revert "qtui: Fix translations in menu bar."
Sorry, wrong way to fix this.

This reverts commit 25b5aae7e98eca1dd29e685a9d7a1640295fb195.
jack-ng: Fix build under clang++.  Closes: #473.
qtui: save/restore layout from qsettings
qtui: Fix warning "QMainWindow::saveState(): 'objectName' not set for QToolBar".
http://qt-project.org/doc/note_revisions/312/514/view
qtui: Use correct action for "Volume Down".
Convert remaining general plugins to C++ declarations.