FIXED key shortcut to reset image interactor LUT modification
When the user Left Click and move the mouse in a slice viewer (e.g., the axial slice), the LUT is modified interactively thanks to the vtkInteractorStyleImage. This is very handy but there was no simple way to reset the modifications applied to the LUT. The user can now press "R" to reset these modifications. Also fixed by this commit: the colors of the What's This panel made it difficult to read. Text background and foreground colors are now more constrasted and it should be easy to read the what's this help.
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