* Add Custom PCI Vendor and Device ID Support
Allow the user to configure DXVK to use a custom PCI Vendor and Device ID, so that the program behaves the same on different cards.
* Remove AMD/NVIDIA/INTEL Shortcuts
* Remove extra semicolon
* Return DxvkGpuVendor to being an enum class
* Fixed hexadecimal output
Support for extensions can now be queried from the device
object in an efficient way. This will allow the backend to
use optional extensions for the purpose of optimization.
Unlike VK_KHR_maintenance1, not all D3D11 applications rely on
features provided by this extension. Keeping this optional helps
with RenderDoc, which does not expose the extension.
