map() functions could take an impl Display for the 2nd param

[turboladen]

Initially map() and .noremap() were made with the expectation that you'd pass in a static str:

let n = Mapper::new(MapMode::Normal);
n.noremap("<leader>ev", "<cmd>vsplit $MYVIMRC<CR>");

...which works great. but I find that it's also nice to make some helper functions for generating commands that are similar, which end up using lots of format!(). As such, it'd be nice to allow that 2nd param to also accept a String, etc.