modular ui

[eoli3n]

Next to #169

The comment of @jedahan seems to me a comfortable idea.

yeah just instead of making it multiple keys, just a single key, and using the existing rust specification for format.

So instead of

date-format: "%H:%M"
separator: ":"
line-output: "[date_format] [nick][separator] [message]" 

you would have something like

format: "{timestamp.hour:0>2}:{timestamp.minute:0>2} {nick}: {message}"