Fix not saving changes to settings asset data file

Add calling EditorUtility.SetDirty(object) after VIUSettings
and VIUProjectSettings being changed.

Author: lawwong

Assets/HTC.UnityPlugin/ViveInputUtility/Scripts/Editor/VIUProjectSettings.cs

@@ -57,6 +57,9 @@ public void OnBeforeSerialize()
                     m_ignoreKeys.Clear();
                     m_ignoreKeys.AddRange(m_ignoreKeySet);
                 }
+
+                EditorUtility.SetDirty(this);
+
                 m_isDirty = false;
             }
         }

Assets/HTC.UnityPlugin/ViveInputUtility/Scripts/Editor/VIUSettingsEditor.cs

@@ -913,6 +913,8 @@ private static void OnVIUPreferenceGUI()
                 {
                     AssetDatabase.CreateAsset(VIUSettings.Instance, defaultAssetPath);
                 }
+
+                EditorUtility.SetDirty(VIUSettings.Instance);
             }
 
             if (!string.IsNullOrEmpty(assetPath))

Assets/HTC.UnityPlugin/ViveInputUtility/Scripts/VIUVersion.cs

@@ -6,6 +6,6 @@ namespace HTC.UnityPlugin.Vive
 {
     public static class VIUVersion
     {
-        public static readonly Version current = new Version("1.8.0.3");
+        public static readonly Version current = new Version("1.8.0.4");
     }
 }