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/gpu/vulkan/premake5.lua

@@ -7,6 +7,7 @@ project("xenia-gpu-vulkan")
   kind("StaticLib")
   language("C++")
   links({
+    "fmt",
     "volk",
     "xenia-base",
     "xenia-gpu",
@@ -31,6 +32,7 @@ project("xenia-gpu-vulkan-trace-viewer")
   links({
     "aes_128",
     "capstone",
+    "fmt",
     "glslang-spirv",
     "imgui",
     "libavcodec",
@@ -97,6 +99,7 @@ project("xenia-gpu-vulkan-trace-dump")
   links({
     "aes_128",
     "capstone",
+    "fmt",
     "glslang-spirv",
     "imgui",
     "libavcodec",