task_local context over context objects

- interner impls logically separate from API in orchid-base (default host interner still in base for testing)
- error reporting, logging, and a variety of other features passed down via context in extension, not yet in host to maintain library-ish profile, should consider options
- no global spawn mechanic, the host has a spawn function but extensions only get a stash for enqueuing async work in sync callbacks which is then explicitly, manually, and with strict order popped and awaited
- still deadlocks nondeterministically for some ungodly reason

orchid-std/src/macros/rule/shared.rs

@@ -3,7 +3,7 @@
 use std::fmt;
 
 use itertools::Itertools;
-use orchid_base::interner::Tok;
+use orchid_base::interner::IStr;
 use orchid_base::name::Sym;
 use orchid_base::side::Side;
 use orchid_base::tokens::{PARENS, Paren};
@@ -11,12 +11,12 @@ use orchid_base::tokens::{PARENS, Paren};
 pub enum ScalMatcher {
 	Name(Sym),
 	S(Paren, Box<AnyMatcher>),
-	Placeh { key: Tok<String> },
+	Placeh { key: IStr },
 }
 
 pub enum VecMatcher {
 	Placeh {
-		key: Tok<String>,
+		key: IStr,
 		nonzero: bool,
 	},
 	Scan {
@@ -41,7 +41,7 @@ pub enum VecMatcher {
 		/// the length of matches on either side.
 		///
 		/// Vectorial keys that appear on either side, in priority order
-		key_order: Vec<Tok<String>>,
+		key_order: Vec<IStr>,
 	},
 }