Merge pull request #1 from google/develop

Fix ubsan failure, divide-by-zero in Range::PercentClamped

Disable ubsan errors for CompactSpline variable-length arrays

Support CubicSpline GLTF interpolation type.

Keyframe conversion utils for raw CompactSplines.

Qualify calls to some functions from <cmath>.

Filter quaternion flips in keyframe conversion utility.

Avoid a divide-by-zero error in linear keyframe conversion.

Add kCubicSpline interpolation type.

Add linear and step interpolation support to the keyframe conversion functions.

Make spline-from-keyframe functions standalone in Motive.

Take into account y_scale and y_offset when calculating blend init.

Fix rotation weighting in sustained blends.

Remove full path include, short path already exists.

Remove operator[].