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/base/socket.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. *
  ******************************************************************************
  */
@@ -91,7 +91,7 @@ class Socket {
 
   // Asynchronously sends a string buffer.
   // Returns false if the socket is disconnected or the data cannot be sent.
-  bool Send(const std::string& value) {
+  bool Send(const std::string_view value) {
     return Send(value.data(), value.size());
   }
 };