* AClientHandler.cs:
  Cleaned up imports.

* IrcClient.cs:
  Added safety check for line processing.
  Switched line delimter to \0 from \n.
  Trimmed unused buffer space from read lines.
  Added Leave method.


* TwitchHandler.cs:
  Added message filtering to get rid of useless messages.
  Only print unknown lines in debug mode.
  Added leave command.

* Program.cs:
  Now captures exceptions.