1.0 - Full refactor and milestone

[hexjelly]

This could probably use a full rewrite, as it was a Rust learning project. When? Who knows.

Things to implement:

• Better errors
• Docs:
  • Add more standalone examples
  • Add more documentation + doc-examples
• Serde support
• Fix API to be more idiomatic Rust
• Split up parsing better; consider using nom/combine probably overkill and too much work for no sensible gain, if any.
• Add Across support (see domi's python lib)
• Add state.dat support
  • Read/write best times
  • Read/write players/settings
• Add LGR support (Details)
• Switch to geo crate (potentially easier geometry checks?)
• Topology checks:
  • Head inside ground
  • Apple fully inside ground
  • Crossing polygon edges
  • Missing start or exit
  • Level dimensions
  • Object, polygon, picture and vertex limits
• std::fs::read all the things

[Smibu]

I can work on state.dat stuff.