vout: pass enum for window state instead of boolean (refs #10302)
vout: add proper core-managed object variable for wall paper mode
hotkeys: fix wall-paper toggling
qt4: update wall-paper mode toggling
XCB: remove wall-paper mode legacy hacks
Direct3D: remove wall-paper playlist hack

This is now managed by the playlist and video output core.
DirectDraw: remove wall-paper playlist hack