gpu: Report renderer errors with exceptions

Instead of using a two step initialization to report errors, initialize
the GPU renderer and rasterizer on the constructor and report errors
through std::runtime_error.

src/video_core/vulkan_common/vulkan_device.h

@@ -23,7 +23,7 @@ enum class FormatType { Linear, Optimal, Buffer };
 const u32 GuestWarpSize = 32;
 
 /// Handles data specific to a physical device.
-class Device final {
+class Device {
 public:
     explicit Device(VkInstance instance, vk::PhysicalDevice physical, VkSurfaceKHR surface,
                     const vk::InstanceDispatch& dld);

src/video_core/vulkan_common/vulkan_wrapper.h

@@ -344,6 +344,9 @@ public:
     /// Construct an empty handle.
     Handle() = default;
 
+    /// Construct an empty handle.
+    Handle(std::nullptr_t) {}
+
     /// Copying Vulkan objects is not supported and will never be.
     Handle(const Handle&) = delete;
     Handle& operator=(const Handle&) = delete;