* first shot at some gh actions
* skip 3.9 for now
* try windows 3.7
* try an older windows
* drop travis for now (and probably ever)
* fix pypy alias
* wip a better approach for multicharacter newlines perhaps
* better test and doc for windows
* let's get some more output
* more output
* here we go with some detachment
* account for different OS lineseps
* out with the prev
* out with the prints
* clearer and more friendly atomic_save doctest
* faster ci with pip caching
* fix gh action yaml
* remove appveyor
* bit of comment cleanup
* bring windows ci in line with linux and mac