Add selection-dependent, per-viewer, frame decoration support

[adamkewley]

Related #954

Currently, the only way for a user to see a frame in the model is to toggle all frames using a model-level property (#954). However, it becomes extremely obnoxious to visualize frames when there's a large amount of them clustered in a small area. It would be better if OSC provided a visualizer-level toggle where users can request that frames are shown for the current selection.