Add hooks for KHX extensions that were supported
Add hooks for KHX extensions that were supported

* This was a bad merge from the private branch where support was
  implemented, these hooks were lost somehow.

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