A formatter/linter and style guide

[eliassjogreen]

A simple formatter and linter, like clippy using the whistle lexer, parser and AST would be nice to have. In my opinion it should be opinionated, and be able to also only check for formatting errors instead of always fixing them. Along with the formatter we should also provide a standard style guide.

Here's my proposal for a minimal style guide we can start with:

• 2 spaces instead of tabs
• snake_case for everything but types which should be PascalCase
• docs should always start with ///