BCH Atomic Swaps

The new year began with a call from BCA](https://t.me/bchbuilders/26496) to look again at XMR-BCH atomic swaps. @phcitizen worked on this since October but has been missing lately, so pat stepped up to give it a try. Little did he know that @phcitizen was nearing the completion of this challenge and how both were racing to win it. In the end, pat submitted his solution just 2 hours late to win this race. However, the knowledge he gained is substantial, and the software he created is sound enough to be run in a user-facing dAPP in a browser. Teaming up with @bitcoincashautist they want to complete the implementation of BCH-XMR atomic swaps and research other cross-chain atomic swaps such as BCH-BTC, BCH-LTC and BCH-DOGE.