[Util] DndActionsMixin.
[Overall] Enable clang-specific preprocessor kludges on Qt4 only.
[LMP] Removed handleAlbumArt() slot.

It breaks with Qt5 for some reason.

moc rules, C++ rules, why do we need language-level introspection in 2014
after all?
[Azoth Xoox] Fixed narrowing cast.
[LMP] Fixed preprocessor Q_DECLARE_METATYPE.
[LMP] Initial Qt5 compatibility.
[LMP] Qt5-compatible QML stubs.
[LMP] Fixed QML view sizing/placing.
[LMP] Fixed Qt4 build.
[LMP] Removed bioview blur animation in Qt5.
[LMP] Fixed blurring in Qt5 versions.
[LMP] Use Gaussian blur on Qt5 instead of recursive.
[CM] Qt5 compatibility.
[CL] Set default value for update interval.
[CL] Qt5-compatible QML.
[CL] Qt5 compatibility.
[SB2] openWindow() deprecation warning.
[Core] Added Common.openWindow() method.
[HS] Use Common.openWindow() on Qt5.
[CL] Qt5-compatible QML.