Starting to separate the context and parsed tokens into their own modules.

src/context/mod.rs

@@ -0,0 +1,11 @@
+mod exiting;
+mod list;
+mod parser_context;
+mod parser_with_context;
+
+type RefContext<'r, 's> = &'r Context<'r, 's>;
+trait ContextMatcher =
+    for<'r, 's> Fn(RefContext<'r, 's>, OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>>;
+type DynContextMatcher<'c> = dyn ContextMatcher + 'c;
+trait Matcher = for<'s> Fn(OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>>;
+type DynMatcher<'c> = dyn Matcher + 'c;