Started load directive.

Semantic_Analysis.jai

@@ -1783,7 +1783,9 @@ check :: (result : *Compile_Result) {
 
 	init_semantic_checker(*checker, result.root, result.file.path);
 
-	// @Performance: Should have this built in stuff done earlier and only once
+	// Actually, these are not built-ins, they should be a core lib you import.
+	// So if we add imports, we can just add this file.
+	// Maybe we should just do #load
 	add_builtins(*checker);
 	checker.result.file = file;