Highlight messages for user's nick

[chkimes]

Currently, a user can direct a message at you with @nickname, but it can easily get lost in the spam. These messages should be visually distinguished so it's easier to follow a conversation in a busy channel.

[chkimes]

Oh, apparently someone already did this in #26. I think using CSS styles is a better way of handling this, though.

[M4GNV5]

+1

[chkimes]

@ToastyStoemp Nice catch, thanks!