cleanup, CMake >= 3.10

v1.1.1

cmake >= 3.10, better feedback, Numpy 1.20 types

apply updates to python / cmake from wmm2020 v1.1.0

same updates to Python and CMake (not WMM model code) as WMM2020 v1.1.0.

keep build within package dir

v1.0.1

keep build within pkg dir

build on run

complete integration of the "build on run" install method, which is setuptools-agnostic.

Move CI to GitHub Actions.

initial release

CI on Mac, Linux, Windows