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/hoverables_example.dart

@@ -0,0 +1,39 @@
+import 'package:flame/components.dart';
+import 'package:flame/extensions.dart';
+import 'package:flame/game.dart';
+import 'package:flame/input.dart';
+import 'package:flutter/material.dart';
+
+class HoverablesExample extends FlameGame with HasHoverables, TapDetector {
+  static const String description = '''
+    This example shows how to use `Hoverable`s.\n\n
+    Add more squares by clicking and hover them to change their color.
+  ''';
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+    add(HoverableSquare(Vector2(200, 500)));
+    add(HoverableSquare(Vector2(700, 300)));
+  }
+
+  @override
+  void onTapDown(TapDownInfo info) {
+    add(HoverableSquare(info.eventPosition.game));
+  }
+}
+
+class HoverableSquare extends PositionComponent with Hoverable {
+  static final Paint _white = Paint()..color = const Color(0xFFFFFFFF);
+  static final Paint _grey = Paint()..color = const Color(0xFFA5A5A5);
+
+  HoverableSquare(Vector2 position)
+      : super(position: position, size: Vector2.all(100)) {
+    anchor = Anchor.center;
+  }
+
+  @override
+  void render(Canvas canvas) {
+    canvas.drawRect(size.toRect(), isHovered ? _grey : _white);
+  }
+}