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Add global scope left/right arrow key shortcuts for the view

The thumbnails list responds to the left and right arrow key, but if the view happens to be fixed (e.g. by having clicked on it) then these shortcuts stop working, because the view doesn't natively handle the left and right arrow keys for this, and the applicable actions in the actionCollection don't have shortcuts bound.

This commit adds those shortcuts. They don't conflict with anything else that uses it because any local handling of these keys (e.g in the thumbnail strip) will override them.

cc @ahiemstra @ndavis

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