R2 = window handle
R3 = icon handle
R4 = foreground colour (0-15 or -1 to keep the same)
R5 = background colour (0-15 or -1 to keep the same)
Exit:
R0 = old foreground colour + old background colour * 16
Changes the specified icon's colour(s). If there is no
change then the icon is not updated (ie. it doesn't
flicker). This call will now work for anti-aliased
fonts, but the icon MUST have an 'F' validation command,
as the Wimp needs this to specify the icon's colour.
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