some early steps remaking the GUI with UnityEngine.UI, working in all tested game so far

src/Unstrip/IMGUI/ScrollViewStateUnstrip.cs

@@ -1,89 +0,0 @@
-#if CPP
-using System;
-using System.Collections.Generic;
-using UnityEngine;
-
-namespace Explorer.Unstrip.IMGUI
-{
-    public class ScrollViewStateUnstrip
-    {
-        public Rect position;
-        public Rect visibleRect;
-        public Rect viewRect;
-        public Vector2 scrollPosition;
-        public bool apply;
-
-		public void ScrollTo(Rect pos)
-		{
-			this.ScrollTowards(pos, float.PositiveInfinity);
-		}
-
-		public bool ScrollTowards(Rect pos, float maxDelta)
-		{
-			Vector2 b = this.ScrollNeeded(pos);
-			bool result;
-			if (b.sqrMagnitude < 0.0001f)
-			{
-				result = false;
-			}
-			else if (maxDelta == 0f)
-			{
-				result = true;
-			}
-			else
-			{
-				if (b.magnitude > maxDelta)
-				{
-					b = b.normalized * maxDelta;
-				}
-				this.scrollPosition += b;
-				this.apply = true;
-				result = true;
-			}
-			return result;
-		}
-
-		private Vector2 ScrollNeeded(Rect pos)
-		{
-			Rect rect = this.visibleRect;
-			rect.x += this.scrollPosition.x;
-			rect.y += this.scrollPosition.y;
-			float num = pos.width - this.visibleRect.width;
-			if (num > 0f)
-			{
-				pos.width -= num;
-				pos.x += num * 0.5f;
-			}
-			num = pos.height - this.visibleRect.height;
-			if (num > 0f)
-			{
-				pos.height -= num;
-				pos.y += num * 0.5f;
-			}
-			Vector2 zero = Vector2.zero;
-			if (pos.xMax > rect.xMax)
-			{
-				zero.x += pos.xMax - rect.xMax;
-			}
-			else if (pos.xMin < rect.xMin)
-			{
-				zero.x -= rect.xMin - pos.xMin;
-			}
-			if (pos.yMax > rect.yMax)
-			{
-				zero.y += pos.yMax - rect.yMax;
-			}
-			else if (pos.yMin < rect.yMin)
-			{
-				zero.y -= rect.yMin - pos.yMin;
-			}
-			Rect rect2 = this.viewRect;
-			rect2.width = Mathf.Max(rect2.width, this.visibleRect.width);
-			rect2.height = Mathf.Max(rect2.height, this.visibleRect.height);
-			zero.x = Mathf.Clamp(zero.x, rect2.xMin - this.scrollPosition.x, rect2.xMax - this.visibleRect.width - this.scrollPosition.x);
-			zero.y = Mathf.Clamp(zero.y, rect2.yMin - this.scrollPosition.y, rect2.yMax - this.visibleRect.height - this.scrollPosition.y);
-			return zero;
-		}
-	}
-}
-#endif