[Vulkan] Remove old Vulkan code, change shaders directory, create empty Vulkan backend

src/xenia/gpu/vulkan/vulkan_shader.h

@@ -1,43 +0,0 @@
-/**
- ******************************************************************************
- * Xenia : Xbox 360 Emulator Research Project                                 *
- ******************************************************************************
- * Copyright 2016 Ben Vanik. All rights reserved.                             *
- * Released under the BSD license - see LICENSE in the root for more details. *
- ******************************************************************************
- */
-
-#ifndef XENIA_GPU_VULKAN_VULKAN_SHADER_H_
-#define XENIA_GPU_VULKAN_VULKAN_SHADER_H_
-
-#include <string>
-
-#include "xenia/gpu/shader.h"
-#include "xenia/ui/vulkan/vulkan_context.h"
-
-namespace xe {
-namespace gpu {
-namespace vulkan {
-
-class VulkanShader : public Shader {
- public:
-  VulkanShader(ui::vulkan::VulkanDevice* device, xenos::ShaderType shader_type,
-               uint64_t data_hash, const uint32_t* dword_ptr,
-               uint32_t dword_count);
-  ~VulkanShader() override;
-
-  // Available only if the shader is_valid and has been prepared.
-  VkShaderModule shader_module() const { return shader_module_; }
-
-  bool Prepare();
-
- private:
-  ui::vulkan::VulkanDevice* device_ = nullptr;
-  VkShaderModule shader_module_ = nullptr;
-};
-
-}  // namespace vulkan
-}  // namespace gpu
-}  // namespace xe
-
-#endif  // XENIA_GPU_VULKAN_VULKAN_SHADER_H_