catgirl 2.0

This release allows completing a nick at the beginning of a message
without adding a colon by continuing to press tab. It parses raw
IRC formatting codes in the timestamp format string, allowing the
default style to be overridden.

This release handles RPL_WHOISSPECIAL and requests the znc.in/self-message
capability when available. It fixes window name casing issues,
handling of colons in sasl-plain, showing list modes with /mode and
strptime compatibility.

The configure script now uses the PKG_CONFIG environment variable.

Thanks to Alyssa Ross and psykose for contributions to this release.