Mouse wheel horizontal axis control

Setting "Mouse wheel horizontal axis control" doesn't change anything. Horizontal wheel events (left/right) are processed like if they are Vertical wheel events (up/down).

Function qtWheelEventToVLCKey() in modules/gui/qt/util/customwidgets.cpp doesn't take into account if the event is a Horizontal one or a Vertical one. See https://github.com/videolan/vlc/blob/master/modules/gui/qt/util/customwidgets.cpp

A patch is attached to get it processed correctly.

It works for all settings : volume, position and position reversed.

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