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/utils/timer_component_example.dart

@@ -0,0 +1,53 @@
+import 'package:flame/components.dart';
+import 'package:flame/game.dart';
+import 'package:flame/input.dart';
+import 'package:flutter/material.dart';
+
+class TimerComponentExample extends FlameGame
+    with TapDetector, DoubleTapDetector {
+  static const String description = '''
+    This examples showcases the `TimerComponent`.\n\n
+    Tap to start a timer that lives for one second and double tap to start
+    another timer that lives for 5 seconds.
+  ''';
+
+  RenderedTimeComponent? tapComponent;
+  RenderedTimeComponent? doubleTapComponent;
+
+  @override
+  void onTap() {
+    tapComponent?.removeFromParent();
+    tapComponent = RenderedTimeComponent(1);
+    add(tapComponent!);
+  }
+
+  @override
+  void onDoubleTap() {
+    doubleTapComponent?.removeFromParent();
+    doubleTapComponent = RenderedTimeComponent(5, yOffset: 180);
+    add(doubleTapComponent!);
+  }
+}
+
+class RenderedTimeComponent extends TimerComponent {
+  final TextPaint textPaint = TextPaint(
+    style: const TextStyle(color: Colors.white, fontSize: 20),
+  );
+
+  final double yOffset;
+
+  RenderedTimeComponent(double period, {this.yOffset = 150})
+      : super(
+          period: period,
+          removeOnFinish: true,
+        );
+
+  @override
+  void render(Canvas canvas) {
+    textPaint.render(
+      canvas,
+      'Elapsed time: ${timer.current.toStringAsFixed(3)}',
+      Vector2(30, yOffset),
+    );
+  }
+}