issue 81: Change descriptor type from UBO -> uniform texel buffer, since UBOs don...

issue 81: Change descriptor type from UBO -> uniform texel buffer, since UBOs don't use views. Change fragment shader to match. Change buffer contents to a vector of uint32 to match the R32_UINT view format. Update reference value selection to match. Remove 'offset' which was just added into elementOffset, and just cause alignment problems.