Get The Current Value Of Environmental Variable Settings In Neovim

Put a `?` at the end of a `:set SETTING` string. For example:

Will show something like:

If there is no value set, it'll just output the key. For example if `timeout` isn't set, doing:

will return

via: https://stackoverflow.com/a/2078272/102401

See also this for a way to get all the env stuff:

- https://vim.fandom.com/wiki/Displaying_the_current_Vim_environment