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/multitap_example.dart

@@ -0,0 +1,42 @@
+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';
+
+/// Includes an example including advanced detectors
+class MultitapExample extends FlameGame with MultiTouchTapDetector {
+  static const String description = '''
+    In this example we showcase the multi touch capabilities
+    Touch multiple places on the screen and you will see multiple squares drawn,
+    one under each finger.
+  ''';
+
+  static final whitePaint = BasicPalette.white.paint();
+  static final tapSize = Vector2.all(50);
+
+  final Map<int, Rect> taps = {};
+
+  @override
+  void onTapDown(int pointerId, TapDownInfo info) {
+    taps[pointerId] = info.eventPosition.game.toPositionedRect(tapSize);
+  }
+
+  @override
+  void onTapUp(int pointerId, _) {
+    taps.remove(pointerId);
+  }
+
+  @override
+  void onTapCancel(int pointerId) {
+    taps.remove(pointerId);
+  }
+
+  @override
+  void render(Canvas canvas) {
+    super.render(canvas);
+    taps.values.forEach((rect) {
+      canvas.drawRect(rect, whitePaint);
+    });
+  }
+}