(client) feat:实现摄像机跟踪与移动，实现任意位置生成实体，实现更安全的资源加载方式（指定unity内部加载资源） (#42)

Co-authored-by: zzdxxz <2079238449@qq.com>
Co-committed-by: zzdxxz <2079238449@qq.com>

Client/Assets/Scripts/UI/EntityPlacementUI.cs

@@ -0,0 +1,36 @@
+using Base;
+using TMPro;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace UI
+{
+    
+    public delegate void NonReturnCallback();
+    public class EntityPlacementUI:UIBase,ITickUI
+    {
+        public TMP_Text promptText;
+        
+        public NonReturnCallback currentAction;
+
+        public string Prompt
+        {
+            get => promptText.text;
+            set => promptText.text = value;
+        }
+        public void TickUI()
+        {
+            if (!IsVisible)
+                return;
+            if (Input.GetKeyDown(KeyCode.Escape))
+            {
+                Base.UIInputControl.Instance.Hide(this);
+            }
+            if (currentAction!=null&&Input.GetMouseButtonDown(0))
+            {
+                currentAction();
+            }
+        }
+        
+    }
+}