bold/italic/underline hotkeys

For irc input a parser was added to allow styling (colours aren't yet
supported).
Example:
"text [b][i]test[/i][/b] ya [u]ya[/u]" =>"text \x02\x16test\x16\x02 ya
\x1Fya\x1F"

Rules are specified in util/1constants.js (qwebirc.irc.styles) and
parsed in util/urlifier.js

hotkeys on a irc-input-field:
ctrl+b: bold
ctrl+i: italic
ctrl+u: underline