* IrcComm.cs:
* MeidoCommon.cs: Add support for the Nickname propery.

* RandomChoice.cs: Small change, for clarity.
Massive changes to how Chainey opperates. The entire backend has been changed, including the format of the SQLite database.
The most important improvements are that sentences are now build by searching backwards too. And that IrcChainey uses a producer-consumer setup for processing messages.
Allow end to be 0 and have it do something meaningful, instead of
throwing an exception.