First working version of new system.

_spawns.js

@@ -0,0 +1,15 @@
+module.exports = {
+	start: function () {
+		for (const spawn_name in Game.spawns) {
+			const spawn = Game.spawns[spawn_name];
+			spawn.init();
+		}
+	},
+
+	update: function () {
+		for (const spawn_name in Game.spawns) {
+			const spawn = Game.spawns[spawn_name];
+			if (spawn.requireNewCreep(ROLE_HARVESTER)) spawn.createHarvester();
+		}
+	}
+}