conlang 0.3.0: Total grammar overhaul

- Rewrote the grammar
- Rewrote the AST
- Rewrote the Parser
- Removed pretty printer (now handled by ast::ast_impl::Pretty, a Writer wrapper)
- Added items, and new keywords to go with them
  - Syntax is ~maybe temporary, based on Rust syntax

Cargo.toml

@@ -4,7 +4,7 @@ resolver = "2"
 
 [workspace.package]
 repository = "https://git.soft.fish/j/Conlang"
-version = "0.0.2"
+version = "0.0.3"
 authors = ["John Breaux <j@soft.fish>"]
 edition = "2021"
 license = "MIT"