Hot-Reloading Refactor

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/defer.rs

@@ -0,0 +1,22 @@
+#[macro_export]
+macro_rules! defer {
+	($body:block) => {
+		struct _Defer_<F>
+		where
+			F: FnMut(),
+		{
+			closure: F,
+		}
+
+		impl<F> Drop for _Defer_<F>
+		where
+			F: FnMut(),
+		{
+			fn drop(&mut self) { (self.closure)(); }
+		}
+
+		let _defer_ = _Defer_ {
+			closure: || $body,
+		};
+	};
+}