Add pick layer to SoPickStyle for ordered on-top picking#623
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This will let picked points be ordered across the scene graph independent of depth. SoPickStyle gains a `layer` field (default 0), carried through traversal by the new SoPickLayerElement. SoRayPickAction sorts picked points by layer (descending) and then by distance (ascending), so a higher layer always picks in front while true depth order is preserved within a layer. The existing *_ON_TOP styles are unchanged: they ignore the layer and still sort frontmost. This replaces the previous behaviour where on-top picks collapsed their distance to 0 as the only way to bias picking to the front.
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This will let picked points be ordered across the scene graph independent of depth. SoPickStyle gains a
layerfield (default 0), carried through traversal by the new SoPickLayerElement. SoRayPickAction sorts picked points by layer (descending) and then by distance (ascending), so a higher layer always picks in front while true depth order is preserved within a layer.The existing *_ON_TOP styles are unchanged: they ignore the layer and still sort frontmost. This replaces the previous behaviour where on-top picks collapsed their distance to 0 as the only way to bias picking to the front.
Fixes: #546