Add support for ERC

* User input is faded in order to focus on messages by others
* Keywords are same color as matched parens
* Nicks of others are unbolded cyan
* Server notices are unbolded blue
* Timestamps are faded, not bright

Looks best with the solarized-dark theme.
Make keywords orange

Others don't seem to like this quite as much, so keeping it out of the initial pull request.
tone down widget-field border brightness
Add solarized-termcolors support

solarized-termcolors allows the user to override the number of
display cells used. The default value for solarized-termcolors
is nil, which will use the value of dispay-color-cellThe
default for non supported number of color cells is the 16 color palette.