https://medium.com/@adiach3nko/package-management-with-go-modules-the-pragmatic-guide-c831b4eaaf31 https://github.com/fyne-io/fyne https://github.com/matcornic/subify https://github.com/radovskyb/watcher
fyne-io/fyne#941 https://github.com/fyne-io/fyne/blob/86d26ebe4d97a525aa5cf1b6720186fc76d3b669/cmd/fyne_demo/screens/window.go
go mod init ... go get go get .... go get fyne.io/fyne@develop