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/widgets/sprite_widget_example.dart

@@ -0,0 +1,23 @@
+import 'dart:math';
+
+import 'package:dashbook/dashbook.dart';
+import 'package:flame/widgets.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+final anchorOptions = Anchor.values.map((e) => e.name).toList();
+
+Widget spriteWidgetBuilder(DashbookContext ctx) {
+  return Container(
+    width: ctx.numberProperty('container width', 400),
+    height: ctx.numberProperty('container height', 200),
+    decoration: BoxDecoration(border: Border.all(color: Colors.amber)),
+    child: SpriteWidget.asset(
+      path: 'shield.png',
+      angle: pi / 180 * ctx.numberProperty('angle (deg)', 0),
+      anchor: Anchor.valueOf(
+        ctx.listProperty('anchor', 'center', anchorOptions),
+      ),
+    ),
+  );
+}