example: adds SDL3 example (callback main) (#533)

example: adds SDL3 example (#532)

example: clarifies EGL loading steps with comments (#531)

vk: pins vulkan spec to working commit

rust: makes struct members pub

c: silence VS 'function call missing argument list' warnings

example: closes win32 window properly in WGL example (#504)

cmake: adds missing CMake vulkan example and removes extra white spaces (#494)

setup: Bumped version: 2.0.8.

utility: use modern version to build package

files: updates to latest specifications

readme: add plugin section

glad: replace setup.py with pyproject.toml (#490)

rust: replace static mut references with addr_of

setup: Bumped version: 2.0.7.