[3PP] Replaced cpptoml with tomlplusplus

Also adjusted code that used cpptoml to be used with toml++ and some more changes

src/xenia/config.h

@@ -11,10 +11,9 @@
 #define XENIA_CONFIG_H_
 
 #include <filesystem>
-#include "third_party/cpptoml/include/cpptoml.h"
+#include "third_party/tomlplusplus/toml.hpp"
 
-std::shared_ptr<cpptoml::table> ParseFile(
-    const std::filesystem::path& filename);
+toml::parse_result ParseFile(const std::filesystem::path& filename);
 
 namespace config {
 void SetupConfig(const std::filesystem::path& config_folder);