update registry parser and uprev to vk v1.3.248
The latest registry has updated a few things:
- vulkansc support
- syntax change over core api and extension dependencies
- miscs
This MR adds support for both legacy and latest registry.
Test:
- ./utils/update_vk_xml.sh v1.3.248
- meson out
- ninja -C out
Closes: #8 (closed)