* Add Index Buffer conversion for quads to Vulkan
Also adds a reusable repeating pattern index buffer to use for non-indexed
draws, and generalizes the conversion cache for buffers.
* Fix some issues
* End render pass before conversion
* Resume transform feedback after we ensure we're in a pass.
* Always generate UInt32 type indices for topology conversion
* No it's not.
* Remove unused code
* Rely on TopologyRemap to convert quads to tris.
* Remove double newline
* Ensure render pass ends before stride or I8 conversion
