LTS v1.0.3 UI fixes

Fixed #189 toolbar not showing up introduced in f82311c (v1.0.3)
Improved GUISkin handling so that the default GUIStyle are always used
	- Fixes some problems with missing styles at Runtime if not explicitly set, as well as issues when switching between dark and light modes
	- New behaviour: Always generate DefaultSkin and save to file for user to copy and modify. If OverriddenSkin.asset exists, use that style as a basis instead.
Fixed issue with XML IO for objects that can not be serialized (e.g. Texture2D in TextureCompose example)

Editor/NodeEditorWindow.cs

@@ -267,12 +267,7 @@ private void OnGUI()
 			}
 
 			// Draw Interface
-			float screenWidth = Screen.width;
-			#if UNITY_EDITOR && UNITY_2019_3_OR_NEWER
-			float scaling = UnityEditor.EditorPrefs.GetInt("CustomEditorUIScale")  / 100.0f;
-			screenWidth = screenWidth / scaling;
-			#endif
-			editorInterface.DrawToolbarGUI(new Rect(0, 0, screenWidth, 0));
+			editorInterface.DrawToolbarGUI();
 			editorInterface.DrawModalPanel();
 
 			// End Node Editor GUI

Runtime/Framework/Interface/NodeEditorGUI.cs

@@ -32,35 +32,40 @@ public static partial class NodeEditorGUI
 
 		public static bool Init ()
 		{
-			List<GUIStyle> customStyles = new List<GUIStyle> (); 
+			overrideSkin = ResourceManager.LoadResource<GUISkin> ("OverrideSkin.asset");
+			if (overrideSkin == null)
+			{ // Create default skin from scratch
+				if (!CreateDefaultSkin ()) return false;	
+				overrideSkin = Object.Instantiate (defaultSkin);
+			}
+			else
+			{ // Use override
+				overrideSkin = Object.Instantiate (overrideSkin);
+			}
+
+			// Copy default styles in current setting, modified to fit custom style
+			// This mostly refers to the editor styles
 
-			defaultSkin = ResourceManager.LoadResource<GUISkin> ("DefaultSkin.asset");
-			if (defaultSkin == null) 
-				return CreateDefaultSkin();
-			else {
-				defaultSkin = Object.Instantiate (defaultSkin);
-				// Copy default editor styles, modified to fit custom style
-				customStyles = new List<GUIStyle> (defaultSkin.customStyles);
-				foreach (GUIStyle style in GUI.skin.customStyles)
+			List<GUIStyle> customStyles = new List<GUIStyle> (overrideSkin.customStyles);
+			foreach (GUIStyle style in GUI.skin.customStyles)
+			{
+				if (overrideSkin.FindStyle(style.name) == null)
 				{
-					if (defaultSkin.FindStyle(style.name) == null)
+					GUIStyle modStyle = new GUIStyle (style);
+					if (modStyle.normal.background == null)
 					{
-						GUIStyle modStyle = new GUIStyle (style);
-						if (modStyle.normal.background == null)
-						{
-							modStyle.fontSize = defaultSkin.label.fontSize;
-							modStyle.normal.textColor = modStyle.active.textColor = modStyle.focused.textColor = modStyle.hover.textColor = defaultSkin.label.normal.textColor;
-						}
-						customStyles.Add (modStyle);
+						modStyle.fontSize = overrideSkin.label.fontSize;
+						modStyle.normal.textColor = modStyle.active.textColor = modStyle.focused.textColor = modStyle.hover.textColor = overrideSkin.label.normal.textColor;
 					}
+					customStyles.Add (modStyle);
 				}
-				defaultSkin.customStyles = customStyles.ToArray();
-
-				Background = ResourceManager.LoadTexture ("Textures/background.png");
-				AALineTex = ResourceManager.LoadTexture ("Textures/AALine.png");
-
-				return Background && AALineTex;
 			}
+			overrideSkin.customStyles = customStyles.ToArray();
+
+			Background = ResourceManager.LoadTexture ("Textures/background.png");
+			AALineTex = ResourceManager.LoadTexture ("Textures/AALine.png");
+
+			return Background && AALineTex;
 		}
 
 		public static bool CreateDefaultSkin ()
@@ -177,7 +182,8 @@ public static bool CreateDefaultSkin ()
 
 			defaultSkin.customStyles = customStyles.ToArray();
 #if UNITY_EDITOR
-			UnityEditor.AssetDatabase.CreateAsset(Object.Instantiate (defaultSkin), ResourceManager.resourcePath +  "DefaultSkin.asset");
+			if (!ResourceManager.resourcePath.StartsWith("Packages"))
+				UnityEditor.AssetDatabase.CreateAsset(Object.Instantiate (defaultSkin), ResourceManager.resourcePath +  "DefaultSkin.asset");
 #endif
 
 			return true;