Changes in api and upwards

- Removed out-of-stack error reporting
- Revised module system to match previous Orchid system
- Errors are now in a Vec everywhere
- Implemented atoms and lexer
- Started implementation of line parser
- Tree is now ephemeral to avoid copying Atoms held inside
- Moved numbers into std and the shared parser into base
- Started implementation of Commands

orchid-base/src/tokens.rs

@@ -2,7 +2,7 @@ use orchid_api::tree::{Placeholder, PlaceholderKind};
 
 use crate::interner::{deintern, Tok};
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct OwnedPh {
   pub name: Tok<String>,
   pub kind: PlaceholderKind,