Cleanup project structure

Restructured the project somewhat and cleaned up classes so that things are where they belong. Created "Helpers" folder and put appropriate helper classes in there.

Important things:
- The "GameObject path" methods are now extension methods on UnityEngine.Transform
- Removed AccessTools (Reflection helpers) as there was no use of it. Replaced with ReflectionHelpers class.
- Some improvements to the "Object Reflection" window, should be a bit faster now. Code cleaned up significantly.

src/MainMenu/InspectUnderMouse.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using UnityEngine;
+
+namespace Explorer
+{
+    public class InspectUnderMouse
+    {
+        public static bool EnableInspect { get; set; } = false;
+
+        private static string m_objUnderMouseName = "";        
+
+        public static void Update()
+        {
+            if (CppExplorer.ShowMenu)
+            {
+                if (Input.GetKey(KeyCode.LeftShift) && Input.GetMouseButtonDown(1))
+                {
+                    EnableInspect = !EnableInspect;
+                }
+
+                if (EnableInspect)
+                {
+                    InspectRaycast();
+                }
+            }
+            else if (EnableInspect)
+            {
+                EnableInspect = false;
+            }
+        }
+
+        public static void InspectRaycast()
+        {
+            Ray ray = UnityHelpers.MainCamera.ScreenPointToRay(Input.mousePosition);
+
+            if (Physics.Raycast(ray, out RaycastHit hit, 1000f))
+            {
+                var obj = hit.transform.gameObject;
+
+                m_objUnderMouseName = obj.transform.GetGameObjectPath();
+
+                if (Input.GetMouseButtonDown(0))
+                {
+                    EnableInspect = false;
+                    m_objUnderMouseName = "";
+
+                    WindowManager.InspectObject(obj, out _);
+                }
+            }
+            else
+            {
+                m_objUnderMouseName = "";
+            }
+        }
+
+        public static void OnGUI()
+        {
+            if (EnableInspect)
+            {
+                if (m_objUnderMouseName != "")
+                {
+                    var pos = Input.mousePosition;
+                    var rect = new Rect(
+                        pos.x - (Screen.width / 2), // x
+                        Screen.height - pos.y - 50, // y
+                        Screen.width,               // w
+                        50                          // h
+                    );
+
+                    var origAlign = GUI.skin.label.alignment;
+                    GUI.skin.label.alignment = TextAnchor.MiddleCenter;
+
+                    //shadow text
+                    GUI.Label(rect, $"<color=black>{m_objUnderMouseName}</color>");
+                    //white text
+                    GUI.Label(new Rect(rect.x - 1, rect.y + 1, rect.width, rect.height), m_objUnderMouseName);
+
+                    GUI.skin.label.alignment = origAlign;
+                }
+            }
+        }
+    }
+}