feature: Simplify generation and usage of bindings

[ConnorGray]

This PR makes:

• Significantly improves the pre-generated bindings generation script, so that it is now easier to generate bindings covering wstp-rs's supported platform.
• Changes wstp-sys build.rs to always use pre-generated bindings
  • This also removes the build-time dependency on bindgen, which slowed down compile times and was sometimes fragile.
• Adds/updates pre-generated bindings for:
  • 13.0.1/{Linux-x86-64, MacOSX-ARM64, MacOSX-x86-64}