Move to ConfigParser for system configuration.

[Chris Earley]

Another step in the process of cleaning up this project to be a bit more presentable. Please hang in there, users!

The nhksettings.py method of inserting constants works but seems a bit lazy from a user interface standpoint. ConfigParser is the defacto python lib for reading in .ini text documents and turning them into python objects that can be used to deliver user settings to applications.

I've used it before for a setting-heavy IRC->Twitterbot project in the past to great effect and will port over some of the code to this project.

In addition, a wizard will be added similar to ZNC's --makeconf functionality that will walk the user through the process of creating the .ini file.