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/input/scroll_example.dart

@@ -0,0 +1,49 @@
+import 'package:flame/extensions.dart';
+import 'package:flame/game.dart';
+import 'package:flame/input.dart';
+import 'package:flame/palette.dart';
+import 'package:flutter/material.dart';
+
+class ScrollExample extends FlameGame with ScrollDetector {
+  static const String description = '''
+    In this example we show how to use the `ScrollDetector`.\n\n
+    Scroll within the canvas (both horizontally and vertically) and the white
+    square will move around.
+  ''';
+
+  static const speed = 2000.0;
+  final _size = Vector2.all(50);
+  final _paint = BasicPalette.white.paint();
+
+  Vector2 position = Vector2.all(100);
+  Vector2? target;
+
+  @override
+  void onScroll(PointerScrollInfo info) {
+    target = position + info.scrollDelta.game * 5;
+  }
+
+  @override
+  void render(Canvas canvas) {
+    super.render(canvas);
+    canvas.drawRect(position.toPositionedRect(_size), _paint);
+  }
+
+  @override
+  void update(double dt) {
+    super.update(dt);
+    final target = this.target;
+    final ds = speed * dt;
+    if (target != null) {
+      if (position != target) {
+        final diff = target - position;
+        if (diff.length < ds) {
+          position.setFrom(target);
+        } else {
+          diff.scaleTo(ds);
+          position.setFrom(position + diff);
+        }
+      }
+    }
+  }
+}