Apply button in Property editor does not close the editor window anymore. Adds an additional OK Button. Fixes https://bugs.launchpad.net/mixxx/+bug/913255
Update bpm-lock graphics in library table, similar to the preview graphics. More easy to differentiate between the actual lock state. Added graphics to the icon template.
Merge pull request #114 from esbrandt/lp913255

Apply button in Property editor does not close the editor window anymore...
Initialize these pointers to NULL for clarity.
Add QT_WIDGETS_LIB define when including QtWidgets module (need to push this upstream to the qt5.py maintainer).
Add missing QApplication include.
Fix DirectoryDao initialization order.
Merge branch 'master' into master_sync