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

src/ExplorerBehaviour.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using UnityEngine;
+#if CPP
+using UnhollowerRuntimeLib;
+#endif
+
+namespace UnityExplorer
+{
+    // Handles all Behaviour update calls for UnityExplorer (Update, FixedUpdate, OnPostRender).
+    // Basically just a wrapper which calls the corresponding methods in ExplorerCore.
+
+    public class ExplorerBehaviour : MonoBehaviour
+    {
+        internal static ExplorerBehaviour Instance { get; private set; }
+
+        internal static void Setup()
+        {
+#if CPP
+            ClassInjector.RegisterTypeInIl2Cpp<ExplorerBehaviour>();
+#endif
+
+            var obj = new GameObject("ExplorerBehaviour");
+            GameObject.DontDestroyOnLoad(obj);
+            obj.hideFlags |= HideFlags.HideAndDontSave;
+            Instance = obj.AddComponent<ExplorerBehaviour>();
+        }
+
+#if CPP
+        public ExplorerBehaviour(IntPtr ptr) : base(ptr) { }
+#endif
+
+        internal void Update()
+        {
+            ExplorerCore.Update();
+        }
+    }
+}