Prep work on slice settings layering.

SlicerConfiguration/ActiveSliceSettings.cs

@@ -340,6 +340,24 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 
             return "Unknown";
         }
+        /// <summary>
+        /// Returns whether or not the setting is overridden by the active layer
+        /// </summary>
+        /// <param name="sliceSetting"></param>
+        /// <returns></returns>
+        public bool SettingExistsInLayer(string sliceSetting, int layer=0)
+        {
+            bool settingExistsInLayer;
+            if (layer < activeSettingsLayers.Count)
+            {
+                settingExistsInLayer = (activeSettingsLayers[layer].settingsDictionary.ContainsKey(sliceSetting));
+            }
+            else
+            {
+                settingExistsInLayer = false;
+            }
+            return settingExistsInLayer;
+        }
 
         public Vector2 GetActiveVector2(string sliceSetting)
         {

SlicerConfiguration/SliceSettingsLayerSelector.cs

@@ -23,6 +23,12 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
             }
         }
 
+        public int ActiveLayerIndex
+        {
+            get { return activeLayerIndex; }
+        }
+
+
         public void SaveSetting(string settingKey, string settingValue)
         {
             ActiveSliceSettings.Instance.SaveValue(settingKey, settingValue, this.activeLayerIndex);