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

This reverts commit 4280a071f6.

src/UI/Shared/Syntax.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
-namespace ExplorerBeta.UI.Shared
+namespace Explorer.UI.Shared
 {
     public class Syntax
     {