Updated packages, rewrote player = gapless playback, faster loading

just_audio/test/just_audio_test.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:just_audio/just_audio.dart';
+
+void main() {
+  const MethodChannel channel = MethodChannel('just_audio');
+
+  setUp(() {
+    channel.setMockMethodCallHandler((MethodCall methodCall) async {
+      return '42';
+    });
+  });
+
+  tearDown(() {
+    channel.setMockMethodCallHandler(null);
+  });
+
+//  test('getPlatformVersion', () async {
+//    expect(await AudioPlayer.platformVersion, '42');
+//  });
+}