Add appveyor configuration file, including scheduled coverity build
Add appveyor configuration file, including scheduled coverity build

Zorro666/renderdoc,cgmb/renderdoc,Yours3lf/renderdoc,adrianbu/renderdoc,Velro/renderdoc,cgmb/renderdoc,victor-moya/renderdoc,googlestadia/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,TurtleRockStudios/renderdoc_public,Anteru/renderdoc,victor-moya/renderdoc,TurtleRockStudios/renderdoc_public,etnlGD/renderdoc,Yours3lf/renderdoc,cgmb/renderdoc,Anteru/renderdoc,baldurk/renderdoc,Lssikkes/renderdoc,etnlGD/renderdoc,Anteru/renderdoc,Lssikkes/renderdoc,googlestadia/renderdoc,etnlGD/renderdoc,Lssikkes/renderdoc,Lssikkes/renderdoc,adrianbu/renderdoc,moradin/renderdoc,Velro/renderdoc,moradin/renderdoc,moradin/renderdoc,adrianbu/renderdoc,michaelrgb/renderdoc,michaelrgb/renderdoc,michaelrgb/renderdoc,Velro/renderdoc,Yours3lf/renderdoc,Lssikkes/renderdoc,Velro/renderdoc,Velro/renderdoc,victor-moya/renderdoc,Yours3lf/renderdoc,etnlGD/renderdoc,Zorro666/renderdoc,Yours3lf/renderdoc,moradin/renderdoc,Lssikkes/renderdoc,baldurk/renderdoc,Yours3lf/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,victor-moya/renderdoc,adrianbu/renderdoc,Velro/renderdoc,moradin/renderdoc,Anteru/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Anteru/renderdoc,TurtleRockStudios/renderdoc_public,michaelrgb/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,moradin/renderdoc,Anteru/renderdoc,etnlGD/renderdoc,Anteru/renderdoc,victor-moya/renderdoc,michaelrgb/renderdoc,TurtleRockStudios/renderdoc_public,victor-moya/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,adrianbu/renderdoc,baldurk/renderdoc,etnlGD/renderdoc,googlestadia/renderdoc,cgmb/renderdoc,cgmb/renderdoc,adrianbu/renderdoc,googlestadia/renderdoc