EVEN BETTER UPDATE! 17 Jul 19 - The tinyMegaCore is available to make these chips work with the Arduino IDE. We should all be grateful to Spence Konde, @Sander van de Bor and the other contributors. Go HERE: https://github.com/SpenceKonde/megaTinyCore and I will attempt to do a log on it soon.
Update - anyone interested in this project should also take a look at #ATtiny1616 break-out board for Arduino. I have a feeling these ATtiny 0 and 1 series chips will be Arduino IDE compatible before long!