R0 = Colour to be ticked
R2 = 0 to have just colours, 1 to have extra option
Exit:
R0 = Pointer to colour menu
Creates a colour menu (like Edit's 'Background' and 'Foreground' ones),
making the text of each option black or white depending on the brightness of
that colour in the current palette. If the value in R0 on entry is in the
range 0-15 then that colour will be ticked in the menu. The call returns a
pointer to the menu block (in RMA workspace). If the value in R2 on entry is
1 then a 17th option will be added, 'Transparent'. You can change the text of
this by changing the menu block if you want (it's in RMA). The 17th option
will be ticked if R0 on entry is 16.
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