lang: work on various things

- work on new world
  - add file db
  - source_file parsing
  - locs
- fix some test stuff

crates/lang/src/lib.rs

@@ -2,7 +2,9 @@
 
 use crate::lst_parser::syntax_kind::SyntaxKind;
 
+pub mod ast;
 pub mod lst_parser;
+pub mod world;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Lang {}