Implementing better CI

[spacekookie]

There have been a lot of new features implemented recently by PR's (mostly by @alok 😉). I'd be happy to do a release soon but I really want to improve the CI and testing of the project first.

Pinning an old version of void to write a datafile and then opening it again in the current master branch would catch most data loss issues.
If you've got ideas for more testing opportunities, please post them as comments.

I'll try to find the time to take a stab at it this week