Fix examples and improve README after #168 merge

The CI isn't holding back PR merges, and some nitty API changes behind
feature toggles slipped through the cracks.

README.md

@@ -77,7 +77,7 @@ unsafe { device.destroy_buffer(buffer, None) };
 use gpu_allocator::d3d12::*;
 
 let mut allocator = Allocator::new(&AllocatorCreateDesc {
-    device,
+    device: ID3D12DeviceVersion::Device(device),
     debug_settings: Default::default(),
     allocation_sizes: Default::default(),
 });

examples/d3d12-buffer.rs

@@ -10,7 +10,8 @@ mod all_dxgi {
 use log::*;
 
 use gpu_allocator::d3d12::{
-    AllocationCreateDesc, Allocator, AllocatorCreateDesc, ResourceCategory, ToWinapi, ToWindows,
+    AllocationCreateDesc, Allocator, AllocatorCreateDesc, ID3D12DeviceVersion, ResourceCategory,
+    ToWinapi, ToWindows,
 };
 use gpu_allocator::MemoryLocation;
 
@@ -117,7 +118,7 @@ fn main() {
 
     // Setting up the allocator
     let mut allocator = Allocator::new(&AllocatorCreateDesc {
-        device: device.as_windows().clone(),
+        device: ID3D12DeviceVersion::Device(device.as_windows().clone()),
         debug_settings: Default::default(),
         allocation_sizes: Default::default(),
     })

examples/d3d12-visualization/main.rs

@@ -1,5 +1,6 @@
 #![windows_subsystem = "windows"]
 //! Example showcasing [`winapi`] interop with [`gpu-allocator`] which is driven by the [`windows`] crate.
+use gpu_allocator::d3d12::ID3D12DeviceVersion;
 use log::info;
 use raw_window_handle::HasRawWindowHandle;
 
@@ -356,7 +357,7 @@ fn main() {
         };
 
         let mut allocator = Allocator::new(&AllocatorCreateDesc {
-            device: device.as_windows().clone(),
+            device: ID3D12DeviceVersion::Device(device.as_windows().clone()),
             debug_settings: Default::default(),
             allocation_sizes: Default::default(),
         })

src/lib.rs

@@ -89,7 +89,7 @@
 //! # let device = todo!();
 //!
 //! let mut allocator = Allocator::new(&AllocatorCreateDesc {
-//!     device,
+//!     device: ID3D12DeviceVersion::Device(device),
 //!     debug_settings: Default::default(),
 //!     allocation_sizes: Default::default(),
 //! });
@@ -109,7 +109,7 @@
 //! # let device = todo!();
 //!
 //! # let mut allocator = Allocator::new(&AllocatorCreateDesc {
-//! #     device: device,
+//! #     device: ID3D12DeviceVersion::Device(device),
 //! #     debug_settings: Default::default(),
 //! #     allocation_sizes: Default::default(),
 //! # }).unwrap();