Moved the whole status message output distribution into the event system

All messages that are being output onto the console are now events of type 'status-message'. If one or more plugins subscribe for this type of event, they will get a detailed message about the text to output, its color, boldness, and prefix label. If no plugins subscribes to this type, a default output inside the class 'Beliefstate' will do the 'old' way of just cout'ing the text stdout onto the console.

The reason for this is, that a plugin might change the characteristics of the terminal (e.g. ncurses) and 'normal' output might interfer with this. If no such plugin is loaded, everything stays the same. Also, output could now be automatically be logged into a file by a fitting plugin.