title: Update VSCode to C++20
body: <p>I am trying to use Visual Studio Code with C++20 with clangd.</p>
  <p>Unfortunately it seems to be running in C++98.
  I get the following error when using basic things like <code>std::function</code>
  <a href="https://i.stack.imgur.com/Pf7HN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Pf7HN.png" alt="enter image description here" /></a></p>
  <p>I have updated as many settings as I can see to C++20, and the <code>__cplusplus</code> macro now also says 2020. However this problem still persists.</p>
  <p>I can compile without issues using: <code>g++ --std c++20 main.cpp -o main</code></p>
  <p>I am also missing a few <code>.json</code> files. I only have <code>tasks.json</code> in my <code>.vscode</code> folder.</p>