R1 = Pointer to menu structure
R2 = Number of option to shade/unshade (0...nn)
R3 = 0 to unshade, any other to shade
If bit 6 of R2 was set in WimpExt_Initialise:
R3 = 0 to unshade entry, 1 to shade entry, 2 to toggle shade flag
Exit:
R0 = Old state of menu entry (0 for unshaded, 1 for shaded)
Shades or unshades the specified menu entry. If bit 6 of R2 was
set in WimpExt_Initialise then the alternative parameters are
used as shown.
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