C++17ification.

C++17ification!

- Filesystem interaction now uses std::filesystem::path.
- Usage of const char*, std::string have been changed to
  std::string_view where appropriate.
- Usage of printf-style functions changed to use fmt.

src/xenia/gpu/graphics_system.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
@@ -35,7 +35,7 @@ class GraphicsSystem {
  public:
   virtual ~GraphicsSystem();
 
-  virtual std::wstring name() const = 0;
+  virtual std::string name() const = 0;
 
   Memory* memory() const { return memory_; }
   cpu::Processor* processor() const { return processor_; }
@@ -63,7 +63,7 @@ class GraphicsSystem {
 
   virtual void ClearCaches();
 
-  void InitializeShaderStorage(const std::wstring& storage_root,
+  void InitializeShaderStorage(const std::filesystem::path& storage_root,
                                uint32_t title_id, bool blocking);
 
   void RequestFrameTrace();