feat(config): add support for mapping #

[typerslow]

Can now remap to # like so:

[keys.normal]
hash = "toggle_comments"

[the-mikedavis]

# can already be used in keybinds:

[keys.normal]
"#" = "toggle_comments"

[sudormrfbin]

I think removing some of the named keys like semicolon, percent, lt etc and letting them be parsed from their normal representation (;, %, <, etc) might be better altogether. We only really need them for keys with no printable ASCII representation like backspace (and maybe minus since A-- for Alt+minus might be confusing to read).

[archseer]

Opened a new ticket #2369