Using `require` didn't make much sense since most of them are only used in a single place anyway, and it takes care of a few weird interactions in the process (besides not polluting `package.loaded` with useless crap ;)).
* Switch the last few remaining icons to true glyphs
(Del/Backspace & Enter).
Also, allow a glyph to be rendered in (fake) bold, and use it for Enter.
* Update fonts
Pickup the tweaked nerdfonts for the backspace symbol
