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/ui/file_picker.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2015 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. *
  ******************************************************************************
  */
@@ -10,6 +10,7 @@
 #ifndef XENIA_UI_FILE_PICKER_H_
 #define XENIA_UI_FILE_PICKER_H_
 
+#include <filesystem>
 #include <memory>
 #include <string>
 #include <utility>
@@ -34,7 +35,7 @@ class FilePicker {
   FilePicker()
       : mode_(Mode::kOpen),
         type_(Type::kFile),
-        title_(L"Select Files"),
+        title_("Select Files"),
         multi_selection_(false) {}
   virtual ~FilePicker() = default;
 
@@ -44,14 +45,14 @@ class FilePicker {
   Type type() const { return type_; }
   void set_type(Type type) { type_ = type; }
 
-  std::wstring title() const { return title_; }
-  void set_title(std::wstring title) { title_ = std::move(title); }
+  const std::string& title() const { return title_; }
+  void set_title(std::string title) { title_ = std::move(title); }
 
-  std::vector<std::pair<std::wstring, std::wstring>> extensions() const {
+  std::vector<std::pair<std::string, std::string>> extensions() const {
     return extensions_;
   }
   void set_extensions(
-      std::vector<std::pair<std::wstring, std::wstring>> extensions) {
+      std::vector<std::pair<std::string, std::string>> extensions) {
     extensions_ = std::move(extensions);
   }
 
@@ -60,8 +61,10 @@ class FilePicker {
     multi_selection_ = multi_selection;
   }
 
-  std::vector<std::wstring> selected_files() const { return selected_files_; }
-  void set_selected_files(std::vector<std::wstring> selected_files) {
+  std::vector<std::filesystem::path> selected_files() const {
+    return selected_files_;
+  }
+  void set_selected_files(std::vector<std::filesystem::path> selected_files) {
     selected_files_ = std::move(selected_files);
   }
 
@@ -70,11 +73,11 @@ class FilePicker {
  private:
   Mode mode_;
   Type type_;
-  std::wstring title_;
-  std::vector<std::pair<std::wstring, std::wstring>> extensions_;
+  std::string title_;
+  std::vector<std::pair<std::string, std::string>> extensions_;
   bool multi_selection_;
 
-  std::vector<std::wstring> selected_files_;
+  std::vector<std::filesystem::path> selected_files_;
 };
 
 }  // namespace ui