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/nine_tile_box_example.dart

@@ -0,0 +1,39 @@
+import 'package:flame/components.dart';
+import 'package:flame/game.dart';
+import 'package:flame/input.dart';
+import 'package:flutter/material.dart';
+
+class NineTileBoxExample extends FlameGame with TapDetector, DoubleTapDetector {
+  static const String description = '''
+    If you want to create a background for something that can stretch you can
+    use the `NineTileBox` which is showcased here.\n\n
+    Tap to make the box bigger and double tap to make it smaller.
+  ''';
+
+  late NineTileBox nineTileBox;
+  final Vector2 boxSize = Vector2.all(300);
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+    final sprite = Sprite(await images.load('nine-box.png'));
+    nineTileBox = NineTileBox(sprite, tileSize: 8, destTileSize: 24);
+  }
+
+  @override
+  void render(Canvas canvas) {
+    super.render(canvas);
+    final position = (size - boxSize) / 2;
+    nineTileBox.draw(canvas, position, boxSize);
+  }
+
+  @override
+  void onTap() {
+    boxSize.scale(1.2);
+  }
+
+  @override
+  void onDoubleTap() {
+    boxSize.scale(0.8);
+  }
+}