Phase 4.1-4.2: StyleIndex with by_tag/by_class/by_id indexes, replace matching_rules with query_index, build_index after parsing

src/interpreter/mod.rs

@@ -48,6 +48,8 @@ impl Interpreter {
         //let rhei_ctx = RheiContext::new(&rhei_scripts);
         //rhei_ctx.initialize(&mut variables);
 
+        stylesheet.build_index();
+
         Ok(Document { roots, components, variables, rhei_scripts, stylesheet, interner: Interner::new(), tracker })
     }