Replace with forward declarations if needed and includes in .cpp that
now need them.
The idea here is to have our headers have the least amount of impact as
possible on our clients (e.g. compilation time).
This works by aliasing CUSTOM0 - CUSTOM7 to morphing attributes, and by
extending our existing skinning variant.
This PR was tested against some upcoming changes to gltfio.
Issue #1149, #1417
This is a prep step for the upcoming morph feature and does not require
a bump to our material version number.
Stay tuned for a new sample app that demonstrates this feature.
The following type bindings are now complete:
- RenderableManager
- RenderableManager$Builder
- RenderableManager$Bone
- TransformManager
- Box, Camera, Frustum
Note that we need to allow clients to find out if compressed textures
are supported BEFORE the engine is created, so that they can start
downloading the correct set of texture files. To allow this, we now
expose a getSupportedFormats function that creates a throw-away canvas
in order to query extensions (creating a temporary canvas is a technique
that we also used in the old PNG decoder that we removed in 7b36ed4)
