Publish to GitHub Releases from AppVeyer

[dtchepak]

Builds of tagged commits on AppVeyer should use GitHub Release storage.

• Publishing artifacts to GitHub Releases
• AppVeyer artifacts rentention

Artifacts should be published as Draft releases so we can manually check and update notes prior to public release.

you may tell AppVeyor to create a “draft” release so you can perform any final checks before making it public. -- https://www.appveyor.com/docs/deployment/github/