This also changes the underlying `DisplayObjectContainer` method to accept any type of range. Turns out enum trait objects aren't actually trait objects and don't need to worry about object safety!
Add BoundingBox, which will store the AABB of dispaly objects.
Added static_data to Graphic, which is a reference to constant data
shared between each instance of a specific graphic. Currently
holds the render handle, bounding box, and character ID.
Switch from pixels to twips for internal calculations. swf crate
was updated to add a Twips wrapper-type. Ruffle will use this type
internally for transforms and shapes. This fixes some precision
errors in rendering (see heroes_of_cybertron.swf) and will match
what the Flash Player does internally more closely. (e.g.
DisplayObject x and y will be quantized to 1/20 pixel units). It
is up to the renderer to convert units from twip space to pixels
when rendering.
desuwa