3D Universe Window focus

[tischi]

Whenever the time point is changed, the window focus goes onto the 3D Universe.
This is very annoying, e.g. when moving up and down with the arrow keys in the table or moving along time [n, m] in the BDV windows, because the KeyboardListener now sends its input to the 3DUniverse.
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This should be changed that the focus stays on the window that issued the time point change.