Add world.removeContactMaterial method

[Glavin001]

• Add method removeContactMaterial to World
  • Name matches the convention, such as removeContraint
• Add method delete to TupleDictionary
  • Name matches JavaScript built-inMap object which has similar methods & use case
• Add tests

[Glavin001]

After this is merged I can update use-cannon as well: https://github.com/pmndrs/use-cannon/pull/317/files#r780628329

[marcofugaro]

Suggested change

	if (idx !== -1) {
	this.contactmaterials.splice(idx, 1)
	}
	this.contactMaterialTable.delete(cmat.materials[0].id, cmat.materials[1].id)
	if (idx === -1) {
	return
	}
	this.contactmaterials.splice(idx, 1)
	this.contactMaterialTable.delete(cmat.materials[0].id, cmat.materials[1].id)

why is contactMaterialTable.delete not under the check?

[Glavin001]

I think I copied from removeConstraint method.

No objections to the suggested change, thanks!

Pushed update.

[marcofugaro]

Thank you!