PreSave can now cancel the Saving of PCK Files

PCK-Studio/Controls/Editor/EditorControl.cs

@@ -41,15 +41,16 @@ namespace PckStudio.Controls
 
         public void SetSaveContext(ISaveContext<T> saveContext) => SaveContext = saveContext;
 
-        protected virtual void PreSave()
-        { }
+        protected virtual bool PreSave()
+        { return true; }
         
         protected virtual void PostSave()
         { }
 
         public void Save()
         {
-            PreSave();
+            if (!PreSave())
+                return;
             SaveContext.Save(EditorValue);
             PostSave();
         }

PCK-Studio/Controls/Editor/PckEditor.cs

@@ -185,9 +185,11 @@ namespace PckStudio.Controls
             );
         }
 
-        protected override void PreSave()
+        protected override bool PreSave()
         {
             EditorValue.Endianness = BigEndianCheckBox.Checked ? OMI.ByteOrder.BigEndian : OMI.ByteOrder.LittleEndian;
+
+            return true;
         }
 
         protected override void PostSave()