Some files are moved by this:
Copy framework/node.dart into types/ - preparing for framework/'s decomissioning.
Move app/scheduler.dart into sky/scheduler.dart - "app" doesn't really make sense.
As part of the SkyBinding cleanup, I made the hit-testing less
RenderBox-specific, by having the HitTestEntry.target member be a
HitTestTarget, which is an interface with the handleEvent() function,
which is then implemented by RenderBox. In theory, someone could now
extend hit testing from the RenderBox world into their own tree of
nodes, and take part in all the same dispatch logic automatically.
This involved moving all the hit testing type definitions into a new
sky/hittest.dart file.
Renamed SkyBinding._app to SkyBinding._instance for clarity.
Moved code around in SkyBinding so that related things are together.
Made WidgetSkyBinding use the existing SkyBinding.instance singleton
logic rather than having its own copy.
I also added some stub README.md files that describe dependencies.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/1187393002.
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
Review URL: https://codereview.chromium.org/1179333002.
Sprite nodes use Point instead of Vector2
Updates sprite test app
Refactors accounting for pivot points in sprites
Adds abstract NodeWithSize class in Sprites.
Refactors SpriteNode to Sprite
Refactors TransformNode to Node (may need to find another name as it conflicts with Sky's Node).
Sprite system now uses and caches transformation matrices.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/1180703002.
