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/Windows/Reflection/FieldInfoHolder.cs

@@ -0,0 +1,120 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using MelonLoader;
+using UnhollowerBaseLib;
+
+namespace Explorer
+{
+    public class FieldInfoHolder : MemberInfoHolder
+    {
+        public FieldInfo fieldInfo;
+        public object m_value;
+
+        public FieldInfoHolder(Type _type, FieldInfo _fieldInfo)
+        {
+            classType = _type;
+            fieldInfo = _fieldInfo;
+        }
+
+        public override void UpdateValue(object obj)
+        {
+            try
+            {
+                if (obj is Il2CppSystem.Object ilObject)
+                {
+                    var declaringType = this.fieldInfo.DeclaringType;
+
+                    var cast = ReflectionHelpers.Il2CppCast(obj, declaringType);
+                    m_value = this.fieldInfo.GetValue(fieldInfo.IsStatic ? null : cast);
+                }
+                else
+                {
+                    m_value = this.fieldInfo.GetValue(fieldInfo.IsStatic ? null : obj);
+                }
+            }
+            catch (Exception e)
+            {
+                MelonLogger.Log($"Error updating FieldInfoHolder | {e.GetType()}: {e.Message}\r\n{e.StackTrace}");
+            }
+        }
+
+        public override void Draw(ReflectionWindow window)
+        {
+            UIHelpers.DrawMember(ref m_value, ref this.IsExpanded, ref this.arrayOffset, this.fieldInfo, window.m_rect, window.Target, SetValue);
+        }
+
+        public override void SetValue(object obj)
+        {
+            try
+            {
+                if (fieldInfo.FieldType.IsEnum)
+                {
+                    if (Enum.Parse(fieldInfo.FieldType, m_value.ToString()) is object enumValue && enumValue != null)
+                    {
+                        m_value = enumValue;
+                    }
+                }
+                else if (fieldInfo.FieldType.IsPrimitive)
+                {
+                    if (fieldInfo.FieldType == typeof(float))
+                    {
+                        if (float.TryParse(m_value.ToString(), out float f))
+                        {
+                            m_value = f;
+                        }
+                        else
+                        {
+                            MelonLogger.LogWarning("Cannot parse " + m_value.ToString() + " to a float!");
+                        }
+                    }
+                    else if (fieldInfo.FieldType == typeof(double))
+                    {
+                        if (double.TryParse(m_value.ToString(), out double d))
+                        {
+                            m_value = d;
+                        }
+                        else
+                        {
+                            MelonLogger.LogWarning("Cannot parse " + m_value.ToString() + " to a double!");
+                        }
+                    }
+                    else if (fieldInfo.FieldType != typeof(bool))
+                    {
+                        if (int.TryParse(m_value.ToString(), out int i))
+                        {
+                            m_value = i;
+                        }
+                        else
+                        {
+                            MelonLogger.LogWarning("Cannot parse " + m_value.ToString() + " to an integer! type: " + fieldInfo.FieldType);
+                        }
+                    }
+                    else
+                    {
+                        MelonLogger.Log("Unsupported primitive field type: " + fieldInfo.FieldType.FullName);
+                    }
+                }
+
+                if (obj is Il2CppSystem.Object ilObject)
+                {
+                    var declaringType = this.fieldInfo.DeclaringType;
+
+                    var cast = ReflectionHelpers.Il2CppCast(obj, declaringType);
+                    fieldInfo.SetValue(fieldInfo.IsStatic ? null : cast, m_value);
+                }
+                else
+                {
+                    fieldInfo.SetValue(fieldInfo.IsStatic ? null : obj, m_value);
+                }
+            }
+            catch (Exception e)
+            {
+                MelonLogger.Log($"Error setting FieldInfoHolder | {e.GetType()}: {e.Message}\r\n{e.StackTrace}");
+            }
+        }
+    }
+}