所有Simple UI Element，以及Composite Parameter Window初步

Assets/Scripts/DynamicUI/DynamicUIElements/Simple/DynamicUIDropdown.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using Ichni.RhythmGame;
+using TMPro;
+using UnityEngine;
+
+namespace Ichni.Editor
+{
+    public class DynamicUIDropdown : DynamicUIElement
+    {
+        public TMP_Dropdown dropdown;
+
+        public override void Initialize(IBaseElement baseElement, string title, string parameterName)
+        {
+            base.Initialize(baseElement, title, parameterName);
+            dropdown.value = (int)connectedBaseElement.GetType().GetField(parameterName).GetValue(connectedBaseElement); //获取对应变量的值
+            dropdown.onValueChanged.AddListener(ApplyParameters);
+        }
+
+        public void SetUpEnum(Type enumType)
+        {
+            dropdown.options.Clear();
+            List<string> enumNameList = System.Enum.GetNames(enumType).ToList();
+            dropdown.AddOptions(enumNameList);
+        }
+
+        private void ApplyParameters(int value)
+        {
+            connectedBaseElement.GetType().GetField(parameterName).SetValue(connectedBaseElement, value);
+            connectedBaseElement.Refresh();
+        }
+    }
+}