Intrinsic optimizations

Point2& Point2::operator +=(Vector2 const &rhs) {
#if ARM_NEON
	*(float32x2_t*)this = vadd_f32(*(float32x2_t*)this, *(float32x2_t*)&rhs);
	return *this;
#else
	return *this = *this + rhs;
#endif
}