Remove "Core" namespace, move everything in it up one level

src/Config/IConfigElement.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace UnityExplorer.Config
+{
+    public interface IConfigElement
+    {
+        string Name { get; }
+        string Description { get; }
+
+        bool IsInternal { get; }
+        Type ElementType { get; }
+
+        object BoxedValue { get; set; }
+        object DefaultValue { get; }
+
+        object GetLoaderConfigValue();
+
+        void RevertToDefaultValue();
+
+        Action OnValueChangedNotify { get; set; }
+    }
+}