Add Asset loader, added and configured various states

src/macros.rs

@@ -0,0 +1,16 @@
+#[macro_export]
+macro_rules! configure_sets {
+	(
+		$app: expr,
+		$system_set: expr,
+		$condition: expr
+		) => {
+		$app.configure_sets(PreUpdate, $system_set.run_if($condition))
+			.configure_sets(Update, $system_set.run_if($condition))
+			.configure_sets(PostUpdate, $system_set.run_if($condition))
+			.configure_sets(Last, $system_set.run_if($condition));
+		$app.configure_sets(FixedPreUpdate, $system_set.run_if($condition))
+			.configure_sets(FixedUpdate, $system_set.run_if($condition))
+			.configure_sets(FixedPostUpdate, $system_set.run_if($condition));
+	};
+}