Merge branch 'issue_81' into 'master'

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

…n'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.

WIP to allow time for review.

See #81 and #57.

See merge request !141

diff --cc external/vulkancts/modules/vulkan/api/vktApiBufferViewAccessTests.cpp
Simple merge