* added make targets spell and codespell for spelling checks
* fix spelling errors detected by codespell
* added codespell to github workflow
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
* Initial port of travis CI workflow to github
* fix embedded github workflow
* fix embedded github workflow
* fix gcc and lint github workflow
* fix gcc and lint github workflow
* Remove appveyor and travis CI to reduce maintainence
* fix lint CI workflow
* restore appveyor CI
* restore appveyor CI badge
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>