Enabling full support of RT cores
Following #69 (closed) : In geometry handler, the object type has been changed from "RtGeometry" to "RtGeometryTriangle". Following this modification, the "triangle_mesh.cu" is no longer use. Intersections are now computed with an OptiX built-in program for geometryTriangles (thus handling the RT core support for intersection). It has been replaced by a "triangle_attributes.cu" which only sets the attributes for a intersection.
Comparative benchmarks between using RtGeometry vs. RtGeometryTriangles in process, results to be added later.