Add MinimumBoundingTriangle

[micycle1]

Add MinimumBoundingTriangle algorithm.

Fixes #1159

[dr-jts]

This needs a license header (on both files), like:

/*
 * Copyright (c) 2020 Michael Carleton
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
 * and the Eclipse Distribution License is available at
 *
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */