Remove textures with no references

VocaluxeLib/Draw/CTextureRef.cs

@@ -24,7 +24,7 @@ namespace VocaluxeLib.Draw
     /// </summary>
     public class CTextureRef
     {
-        public readonly int ID;
+        public int ID;
 
         public string TexturePath = "";
 
@@ -115,6 +115,16 @@ namespace VocaluxeLib.Draw
             _CalcRatios();
         }
 
+        ~CTextureRef()
+        {
+            if (ID >= 0)
+            {
+                //Free textures that are no longer reference
+                CTextureRef tmp = this;
+                CBase.Drawing.RemoveTexture(ref tmp);
+            }
+        }
+
         private void _CalcRatios()
         {
             // OpenGL has a problem with partial (NPOT) textures, so we remove 1 pixel