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/system_linux.cc

@@ -0,0 +1,28 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <stdlib.h>
+
+#include <string>
+
+#include "xenia/base/assert.h"
+#include "xenia/base/platform_linux.h"
+#include "xenia/base/string.h"
+#include "xenia/base/system.h"
+
+namespace xe {
+
+void LaunchWebBrowser(const std::string& url) {
+  auto cmd = "xdg-open " + url;
+  system(cmd.c_str());
+}
+
+void LaunchFileExplorer(const std::filesystem::path& path) { assert_always(); }
+
+}  // namespace xe