Rewrite reader logic, add separate reader for caching MP4 chunks, add more advanced drain iterators

src/misc.ts

@@ -204,3 +204,10 @@ export const promiseWithResolvers = <T = void>() => {
 
 	return { promise, resolve: resolve!, reject: reject! };
 };
+
+export const removeItem = <T>(arr: T[], item: T) => {
+	const index = arr.indexOf(item);
+	if (index !== -1) {
+		arr.splice(index, 1);
+	}
+};