Quaternion inverse is not the same as conjugate

[mbierlee]

In

gl3n/gl3n/linalg.d

Lines 2097 to 2108 in a010cea

	void invert() {
	x = -x;
	y = -y;
	z = -z;
	}
	alias invert conjugate; /// ditto
	/// Returns an inverted copy of the current quaternion.
	@property Quaternion inverse() const {
	return Quaternion(w, -x, -y, -z);
	}
	alias inverse conjugated; /// ditto

It is stated that the inverse of a quaternion is the same as its conjugate. This is not correct. The conjugate is what it is doing now, the inverse should be conjugate / magnitude_squared.

See also:
https://www.3dgep.com/understanding-quaternions/#quaternion-conjugate
https://www.3dgep.com/understanding-quaternions/#quaternion-inverse

[Naveen447-a11y]

can i work on these

[Dav1dde]

@Naveen447-a11y I have long not had a use for gl3n and I also no longer am using D, so I think it's better if you end up forking if you have an interest in maintaining and keeping the code alive.