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/vec128.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. *
  ******************************************************************************
  */
@@ -10,6 +10,7 @@
 #include <cstddef>
 #include <string>
 
+#include "third_party/fmt/include/fmt/format.h"
 #include "xenia/base/math.h"
 #include "xenia/base/platform.h"
 #include "xenia/base/vec128.h"
@@ -17,10 +18,7 @@
 namespace xe {
 
 std::string to_string(const vec128_t& value) {
-  char buffer[128];
-  std::snprintf(buffer, sizeof(buffer), "(%g, %g, %g, %g)", value.x, value.y,
-                value.z, value.w);
-  return std::string(buffer);
+  return fmt::format("({}, {}, {}, {})", value.x, value.y, value.z, value.w);
 }
 
 }  // namespace xe