Make objective tracking 'optional' via database

diff --git a/DatabaseDefaults.lua b/DatabaseDefaults.lua
index b6f2344..f237e96 100644
--- a/DatabaseDefaults.lua
+++ b/DatabaseDefaults.lua
@@ -6,6 +6,8 @@ addon.defaults = {
     profile = {
         positions = {},

+        trackQuestObjectives = true,
+
         goodcolor = {0, 1, 0},
         badcolor = {1, 0, 0},
         middlecolor = {1, 1, 0},
diff --git a/TomTomLite.lua b/TomTomLite.lua
index 94289d0..ab27226 100644
--- a/TomTomLite.lua
+++ b/TomTomLite.lua
@@ -17,11 +17,11 @@ function addon:Initialize()
     self.arrow:SetPoint("CENTER", 0, 0)
     self.arrow:Hide()

-    self:RegisterEvent("QUEST_POI_UPDATE", "ObjectivesChanged")
-    self:RegisterEvent("QUEST_LOG_UPDATE", "ObjectivesChanged")
+    self:RegisterEvent("QUEST_POI_UPDATE")
+    self:RegisterEvent("QUEST_LOG_UPDATE")
     self:RegisterMessage("TOMTOMLITE_WAYPOINT_ADDED")
-    hooksecurefunc("WatchFrame_Update", function()
-        addon:ObjectivesChanged()
+    hooksecurefunc("WatchFrame_Update", function(self)
+        addon:UpdateQuestObjectives()
     end)
 end

@@ -120,10 +120,6 @@ function addon:TOMTOMLITE_WAYPOINT_ADDED(msg, waypoint, ...)
     self.arrow:Show()
 end

-function addon:ObjectivesChanged(event, ...)
-    self:Scan()
-end
-
 local function POIAnchorToCoord(poiframe)
     local point, relto, relpoint, x, y = poiframe:GetPoint()
     local frame = WorldMapDetailFrame
@@ -153,7 +149,20 @@ local function findQuestFrameFromQuestIndex(index)
     end
 end

-function addon:Scan()
+function addon:QUEST_POI_UPDATE()
+    self:UpdateQuestObjectives()
+end
+
+function addon:QUEST_LOG_UPDATE()
+    self:UpdateQuestObjectives()
+end
+
+function addon:UpdateQuestObjectives()
+    -- Only do an objective scan if the option is enabled
+    if not self.db.profile.trackQuestObjectives then
+        return
+    end
+
     QuestPOIUpdateIcons()

     local watchIndex = 1