chat/kvirc: Import kvirc-5.2.6

KVIrc is a free portable IRC client based on the excellent Qt GUI
toolkit.  KVirc is being written by the KVIrc Development Team with
the contribution of many IRC addicted developers around the world.
It has a full GUI based configuration, built-in help browser, addons
and themes support (configurable from GUI or scripting), transparency
support, drag'n'drop toolbar editing, activity notifier as well as
proxy support, SSL and IPv6 sockets support, a modular arch which
loads modules only when necessary, and a huge API for writing
extensions.