Added ETC2 and ASTC texture variants (Refs #174)
Added ETC2 and ASTC texture variants (Refs #174)

ming4883/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan,jpbruyere/Vulkan,ming4883/Vulkan,SaschaWillems/Vulkan,jpbruyere/Vulkan,ming4883/Vulkan,grim210/Vulkan,grim210/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan