lerp
Linear interpolation (lerp) toward another rotation using spherical linear interpolation (SLERP).
For rotations, we use SLERP instead of linear interpolation in 2D to maintain constant angular velocity throughout the interpolation.
The interpolation follows the shortest path on the unit circle.
Return
the interpolated rotation
Parameters
other
the target rotation to interpolate toward
t
the interpolation parameter in range 0, 1