* modules/audio_output/alsa.c: the aout-device obj var wasn't destroyed properly on probe() failure, preventing other audio plugins from working afterwards.
* modules/gui/skins/src/skin_main.cpp: got rid of the skins shortcut.
* modules/gui/wxwindows/*: the popupmenu is not created inside the timer anymore so the slider will still be active when the popup is triggered.
* modules/video_output/directx/events.c, modules/video_output/x11/xcommon.c, src/playlist/playlist.c: new intf-popupmenu obj var to handle popup context menu requests from the vouts.