Fix syncing projects that mention properties with elevated permissions.

Permission errors aren't reported since I'm not sure what the user could do about them.
Some properties can be set in the model format but not in live-sync mode, like HttpEnabled.

plugin/src/Reconciler.lua

@@ -67,15 +67,34 @@ local function setProperty(instance, key, value)
 		return
 	end
 
-	local ok, err = pcall(function()
+	-- If we don't have permissions to access this value at all, we can skip it.
-		if instance[key] ~= value then
+	local readSuccess, existingValue = pcall(function()
+		return instance[key]
+	end)
+
+	if not readSuccess then
+		-- An error will be thrown if there was a permission issue or if the
+		-- property doesn't exist. In the latter case, we should tell the user
+		-- because it's probably their fault.
+		if existingValue:find("lacking permission") then
+			Logging.trace("Permission error reading property %s on class %s", tostring(key), instance.ClassName)
+			return
+		else
+			error(("Invalid property %s on class %s: %s"):format(tostring(key), instance.ClassName, existingValue), 2)
+		end
+	end
+
+	local writeSuccess, err = pcall(function()
+		if existingValue ~= value then
 			instance[key] = value
 		end
 	end)
 
-	if not ok then
+	if not writeSuccess then
 		error(("Cannot set property %s on class %s: %s"):format(tostring(key), instance.ClassName, err), 2)
 	end
+
+	return true
 end
 
 local Reconciler = {}