Leverage Coverity scan on AppVeyor

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Related appveyor/ci#144

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Very interesting leads:

• http://help.appveyor.com/discussions/suggestions/497-coverity-static-analysis-support
• https://arkfps.github.io/2015/01/07/using-coverity-scan-with-appveyor/
• https://github.com/csMACnz/coveritypublisher/blob/master/build.tasks.ps1
• https://www.nuget.org/packages/PublishCoverity

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/cc @KindDragon 😉

[KindDragon]

👍