This function sets the clipping area. Graphics contents will be displayed
on the screen only if they are within the clipping area. If the pointer pShape
is NULL, it resets the clipping region the window.
TRUE: The clipping area was set successfully.
If nFlag is set to AEE_GRAPHICS_FRAME, it draws the frame using the current
foreground color and the paint mode, while setting the clipping region.
If nFlag is set to AEE_GRAPHICS_CLEAR, it clears the interior of of the clipping
region while setting it.
If nFlag is set to AEE_GRAPHICS_FILL, it fills the interior using the current
fill color and the current paint mode, while setting the clipping region.
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