Option to show quest levels in dialogs

Adds CONF option to show quest levels in dialogs.

Example: [13] Westfall Stew

Default = 0 (off). Make sure to set UI.ShowQuestLevelsInDialogs to 1 to turn it on

NOTES:

* Do not supply the quest level when using commands such as .lookup quest, it
is not actually part of the title

* Mods that offer this feature do not work properly with TC. They will not put the level in
all dialogs. Users who have such mods should disable the feature or they may see the quest
level listed twice.

Example: [13][13] Westfall Stew