Aims at fixing the range attribute when pre arguments are supplied.

handler.Invoke(pre, ">some text goes here", aft); //now works

Change Log:

• Moved HandlerConfig to Handler and renamed to Handler.Config.
• Handler.Config.Logger is now null by default.
• BaseCommandModule rids the need to implement ICommandModule
• LogLevel.cs added as own file and received new XML comments.
• CollectedCommand.cs added as own file.