added UI handler for inverse toggle, deleted unused script

Assets/Meshing/Scenes/Meshing.unity

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Assets/Meshing/Scripts/KeyUIHandler.cs.meta

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Assets/Meshing/Scripts/KeyUIHandler.cs

+using UnityEngine;
+
+public class KeyUIHandler : MonoBehaviour
+{
+    [SerializeField]
+    GameObject m_UI;
+
+    public GameObject ui
+    {
+        get => m_UI;
+        set => m_UI = value;
+    }
+
+    public void ToggleVisability()
+    {
+        m_UI.SetActive(!m_UI.activeSelf);
+    }
+}

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