Playable demo game and bug fixes in sprites

Updates game for new AppView API

Deletes old test game

Demo game is now playable

Updates demo game with steering and changes in sprites

Fixes smaller bugs in sprites

Refactor class names in game demo

Strips Box2D from game

Fixes ordering in game node

Adds frameRate property to SpriteBox and improves update methods.

Fixes node to box transformations for hit tests

Fixes minor code issues

R=abarth@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/1706642759307ce6bb62d648222b1e44f334e5e0

[viktorl, 2015-06-12 23:12:26]

viktorl@google.com changed reviewers:
+ eseidel@chromium.org

[abarth-chromium, 2015-06-13 00:03:20]

abarth@chromium.org changed reviewers:
+ abarth@chromium.org

[abarth-chromium, 2015-06-13 00:03:21]

lgtm

https://codereview.chromium.org/1179333002/diff/1/sky/examples/game/lib/game_...
File sky/examples/game/lib/game_demo_world.dart (right):

https://codereview.chromium.org/1179333002/diff/1/sky/examples/game/lib/game_...
sky/examples/game/lib/game_demo_world.dart:259: }
We have an operator+ for Point and Size.  I wonder how many of the |b| arguments
might be better represented as Sizes.  The difference between a Point and a Size
is that a Point represents a location in a coordinate system and Size represents
a displacement in the coordinate system.

https://codereview.chromium.org/1179333002/diff/1/sky/examples/game/lib/game_...
sky/examples/game/lib/game_demo_world.dart:263: }
We should just add this to Point.dart

https://codereview.chromium.org/1179333002/diff/1/sky/examples/game/lib/node....
File sky/examples/game/lib/node.dart (right):

https://codereview.chromium.org/1179333002/diff/1/sky/examples/game/lib/node....
sky/examples/game/lib/node.dart:240: canvas.concat(transformMatrix.storage);
\o/

[viktorl, 2015-06-15 16:11:16]

Committed patchset #1 (id:1) manually as
1706642759307ce6bb62d648222b1e44f334e5e0 (presubmit successful).