* Mouse wheel now scrolls the list.
* Up/down key and alt mouse wheel change the active item.
* Adding/removing items from the list now automatically scrolls so the
active item is in the view.
* Shift mouse wheel changes the size of the list widget to display more
items. Lazy replacement for a proper grip.
* Shape key list now displays the influence value next to the name,
* Also fix the range of the value slider to match the defined min/max
range.
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