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/memory.cc

@@ -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. *
  ******************************************************************************
  */
@@ -13,6 +13,7 @@
 #include <cstring>
 #include <utility>
 
+#include "third_party/fmt/include/fmt/format.h"
 #include "xenia/base/assert.h"
 #include "xenia/base/byte_stream.h"
 #include "xenia/base/clock.h"
@@ -124,8 +125,8 @@ Memory::~Memory() {
 }
 
 bool Memory::Initialize() {
-  file_name_ = std::wstring(L"Local\\xenia_memory_") +
-               std::to_wstring(Clock::QueryHostTickCount());
+  file_name_ =
+      fmt::format("Local\\xenia_memory_{}", Clock::QueryHostTickCount());
 
   // Create main page file-backed mapping. This is all reserved but
   // uncommitted (so it shouldn't expand page file).