also perform colorization when the line format is unknown
rename irssilib -> ircformatlib since it's not irssi-specific
add a single script to perform formatting of base log files

In hindsight, separating this formatting into smaller scripts was a bad
idea, since the intermediate outputs were hard to parse and depended on
a specific sequencing of the scripts.
add script to convert some types of log lines from irssi to base format

Base format uses tab separation, making it much easier to parse
remove all *format and *theme style files

Use irssi-to-base.py | base-format.py instead