Organize the Sandbox Panel window (#33684)

* Organize Sandbox Panel

* Map Editing -> Editing

* Unset ToggleMode on Suicide button. Can hardly un-suicide, no?

* Remove 'Link machines' button that has done nothing for 3 years

* Remember Sandbox window's position instead of forcing to center

* Shows Spawns -> Show Spawns

* Remove SandboxSystem.MachineLinking

Content.Client/Sandbox/SandboxSystem.cs

@@ -110,7 +110,7 @@ namespace Content.Client.Sandbox
             }
 
             // Try copy tile.
-            
+
             if (!_map.TryFindGridAt(_transform.ToMapCoordinates(coords), out var gridUid, out var grid) || !_mapSystem.TryGetTileRef(gridUid, grid, coords, out var tileRef))
                 return false;
 
@@ -157,10 +157,5 @@ namespace Content.Client.Sandbox
         {
             _consoleHost.ExecuteCommand("physics shapes");
         }
-
-        public void MachineLinking()
-        {
-            _consoleHost.ExecuteCommand("signallink");
-        }
     }
 }