freebsd: if compiled with Go >= 1.14, support loading third-party pac…

…kages at runtime

(by updating gomacro dependency)

doc: update installation notes for Windows

use github.com/gofrs/uuid instead of github.com/satori/go.uuid; updat…

…e to latest gomacro

use GO111MODULE=on to import packages at runtime

ci: drop Go-1.10 and 1.9, add Go-1.13 and 1.12

really fix gopherdata#174: previous fix broke some imports, including…

… "fyne.io/fyne/widget"

Merge pull request gopherdata#77 from gopherdata/version-1

Update to Version 1 - gomacro, new docs, and more

fix error output, when execution err is nil

fix error output, when execution err is nil

update tests, fix error print bug