Unify examples structure (#1118)

* Animations, CameraAndViewport, CollisionDetection and Components unified

* Added descriptions to effects

* Rename input games

* Unify input stories

* Add info to parallax section

* Added descriptions to the rendering examples

* Add descriptions to the sprites directory

* Fix utils and rendering section

* Add descriptions to the widgets section

* Delete directory that rebase brought back

* Unify game names

* Added some styleguide docs for examples

* Fix analyze issues

* All files should have _example as suffix

* Made the FollowComponentExample a bit easier to understand

* Change priority of ember

examples/lib/stories/rendering/flip_sprite_example.dart

@@ -0,0 +1,32 @@
+import 'package:flame/components.dart';
+import 'package:flame/game.dart';
+
+import '../../commons/ember.dart';
+
+class FlipSpriteExample extends FlameGame {
+  static const String description = '''
+    In this example we show how you can flip components horizontally and
+    vertically.
+  ''';
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+
+    final regular = Ember(position: Vector2(size.x / 2 - 100, 200));
+    add(regular);
+
+    final flipX = Ember(position: Vector2(size.x / 2 - 100, 400));
+    flipX.flipHorizontally();
+    add(flipX);
+
+    final flipY = Ember(position: Vector2(size.x / 2 + 100, 200));
+    flipY.flipVertically();
+    add(flipY);
+
+    final flipWithRotation = Ember(position: Vector2(size.x / 2 + 100, 400))
+      ..angle = 2;
+    flipWithRotation.flipVertically();
+    add(flipWithRotation);
+  }
+}