- Change distinct -> typedef.

- Order of attribute declaration is changed for `alias`.
- Added `LANGUAGE_DEV_VERSION` env constant.
- Rename `anyfault` -> `fault`.
- Changed `fault` -> `faultdef`.
- Added `attrdef` instead of `alias` for attribute aliases.

lib/std/threads/event/event_thread.c3

@@ -21,9 +21,9 @@ struct EventThreadTask
 	Event*[] events;
 }
 
-distinct EventQueue = void;
-distinct EventHandler = void;
-distinct EventMultiQueue = void;
+typedef EventQueue = void;
+typedef EventHandler = void;
+typedef EventMultiQueue = void;
 
 fn EventThreadTask EventQueue.wait_for_task(&self) => EventThreadTask {};