ParametricGeometry: Remove from core.

[Mugen87]

Related issue: Fixed #17381.

Description

The design of ParametricGeometry makes it complex to implement a secure serialization/deserialization.

Considering the very special character of the generator in general, I vote to move the class to the example directory.

[mrdoob]

Hmm, the E2E tests seem to be failing. False alarm?

[Mugen87]

Two examples still used ParametricBufferGeometry instead of ParametricGeometry. Hence, I've overlooked them while searching for ParametricGeometry.

[mrdoob]

Thanks!

[mrdoob]

Should we add something like this to Three.Legacy.js?

export function ParametricGeometry() {

	console.error( 'THREE.ParametricGeometry has been moved to /examples/jsm/geometries/ParametricGeometry.js' );
	return new BufferGeometry();

}

[Mugen87]

Sounds good! Are you going to add this code or should I make another PR?

[Mugen87]

Never mind^^! c5bb543

[mrdoob]

Thanks!