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/vfs/devices/stfs_container_entry.cc

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2014 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. *
  ******************************************************************************
  */
@@ -17,7 +17,7 @@ namespace xe {
 namespace vfs {
 
 StfsContainerEntry::StfsContainerEntry(Device* device, Entry* parent,
-                                       std::string path,
+                                       const std::string_view path,
                                        MultifileMemoryMap* mmap)
     : Entry(device, parent, path),
       mmap_(mmap),
@@ -27,8 +27,9 @@ StfsContainerEntry::StfsContainerEntry(Device* device, Entry* parent,
 StfsContainerEntry::~StfsContainerEntry() = default;
 
 std::unique_ptr<StfsContainerEntry> StfsContainerEntry::Create(
-    Device* device, Entry* parent, std::string name, MultifileMemoryMap* mmap) {
-  auto path = xe::join_paths(parent->path(), name);
+    Device* device, Entry* parent, const std::string_view name,
+    MultifileMemoryMap* mmap) {
+  auto path = xe::utf8::join_guest_paths(parent->path(), name);
   auto entry = std::make_unique<StfsContainerEntry>(device, parent, path, mmap);
 
   return std::move(entry);