Add option to log NPC text

[pjbroad]

gnewbie asked for an option to log NPC text.

Perhaps the simplest version would:

• Enable logging on a per NPC basis.
• Set the option using a checktext box on the NPC name context menu.
• Remember which NPC have the option enabled using a file save to the users configuration folder.
• Log all the text for the NPC dialogue but only to the console.

More complex options could include:

• The NPC dialogue could display a more obvious checkbox at the base of the window.
• Selected from an option in the options window:
  • Logging to a single new log file.
  • Logging to a NPC named log file.
  • Logging to a NPC named tab in the Notebook.

[pjbroad]

Release in 1.9.5p4.