Update on the Mu computer's memory-safe language

Still no type-checking or memory-safety, but we now have local variables.

http://akkartik.name/post/mu-2019-2
https://github.com/akkartik/mu

This post is part of my Freewheeling Apps Devlog.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.