Accessors for all valid component types of TEXCOORD_n and COLOR_n attributes aren't supported

[mrehayden1]

There should probably be some code handling, or at least calling error when encountering unhandled component types in the accessors for these vertex attributes.

Relevant function definitions below.

-- | Decode texture coordinates. Note that we only use the first one.
vertexTexCoords :: GlTF -> Vector GltfBuffer -> AccessorIx -> Vector (V2 Float)
vertexTexCoords = readBufferWithGet getTexCoords

-- | Decode vertex colors
vertexColors :: GlTF -> Vector GltfBuffer -> AccessorIx -> Vector (V4 Word16)
vertexColors = readBufferWithGet getColors

-- | Texture coordinates binary decoder
getTexCoords :: Get (Vector (V2 Float))
getTexCoords = getVec2 getFloat

-- | Vertex colors binary decoder
getColors :: Get (Vector (V4 Word16))
getColors = getVec4 getUnsignedShort

[sgillespie]

That's a good idea. error would work, another idea would be to add some proper error handling (say, adding something like EitherT to the adapter monad). Either way I'd be happy with