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Fix over allocating vertexes for OBJ models with multiple surfaces

Zack Middleton requested to merge zturtleman/netradiant:picomodel-obj-surface-vertexes into master

Loading Wavefront OBJ models in picomodel (used by radiant and q3map2) did not reset the surface vertex index when starting a new surface. This caused there to be unused vertexes, equal to the number of vertexes in all previous surfaces, at the beginning of each surface. Exponential OBJ vertex memory usage as number of surfaces increases. It did not affect displaying or processing the surface faces.

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