[Launcher] Create menu for settings.cfg options
Per "this forum thread":https://forum.openmw.org/viewtopic.php?f=3&t=4520, create a menu much like the Morrowind Code Project's optional settings menu. This would allow fixes and other settings not otherwise accessible in the game's GUI to be enabled without modifying the settings.cfg file manually.
(RM-4054 from redmine: created on 2017-08-31 by Will Herrmann, , closed on 2018-02-05 by Will Herrmann)