setMixByName method
Implementation
void setMixByName(String fromName, String toName, double duration) {
final fromNative = fromName.toNativeUtf8(allocator: _allocator);
final toNative = toName.toNativeUtf8(allocator: _allocator);
_bindings.spine_animation_state_data_set_mix_by_name(_data, fromNative.cast(), toNative.cast(), duration);
_allocator.free(fromNative);
_allocator.free(toNative);
}