rust highlight notes

[Akuli]

Found this file from my computer. Need to check if all items in it are done by now

• [x] highlight await keyword in my editor
• [x] highlight "async move"
• [x] highlight 2usize properly
• [x] highlight "static ref" properly
• [x] highlight "extern crate lazy_static;" properly
• [x] highlight "ref" keyword when i try to write .map(|ref| ref.borrow())
• [x] highlight "Default::default()" somehow nicely?
• [x] highlight Self, both "-> Self" and "Self { ... }"
• [x] highlighting function names and type names properly, similar to C