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Add a per-vertex size buffer (_buffer_user_sizes) and 'user_size' shader attribute to PointCloud. When user_size > 0 the shader uses it instead of the global point_size uniform. Exposed via message type handler in viewer.h and registered as a float-array property in viewer.py.
Add a 'point_shape' uniform to the fragment shader with three modes: circle (0, default, discard outside radius), square (1, no discard), diamond (2, discard outside abs(x)+abs(y)>1). Controlled via set(point_shape='circle'|'square'|'diamond') in Python, with string-to- code mapping and message dispatch in viewer.h.
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