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bvh: sink for ray traced geometry

a bvh (bounding volume hierarchy) is in acceleration structure for ray tracing. this sink here will append the triangle data that is handed in to a global ray tracing bvh by constructing a bottom level acceleration structure which will be combined globally with all other bvh modules you might have on a graph. input might come from a waveform obj file via the i-obj module.

note that it is not necessary to include an edge from here to any ray tracing nodes.

TODO:

• static geometry: flag nodes somehow so BLAS build and dependent compute shaders will be skipped
• producing modules: load obj, spawn particles, deform, animate, extrude with particle sim
• quake: use bvh nodes
• request_read_geo flag to be called request_build_bvh
• geo type on ssbo to multiply by known height and use f16 type etc (maybe need memory type flags)

connectors

• input wire triangulated geometry here, say from an i-obj module