- alien ruin structure drawing order changes

- placing cargo items using syncedRand (items will be in the same position for all clients)
- less confusing waypoint/spawnpoint editing (spawnpoints can't be converted to waypoints or vice versa, and spawnpoint settings aren't shown for waypoints)
- more informative message about missing cargo spawnpoints

Subsurface/Source/GUI/GUIComponent.cs

@@ -47,7 +47,7 @@ namespace Barotrauma
             set;
         }
 
-        public string ToolTip
+        public virtual string ToolTip
         {
             get;
             set;

Subsurface/Source/GUI/GUITextBox.cs

@@ -52,6 +52,19 @@ namespace Barotrauma
             set;
         }
 
+        public override string ToolTip
+        {
+            get
+            {
+                return base.ToolTip;
+            }
+            set
+            {
+                base.ToolTip = value;
+                textBlock.ToolTip = value;
+            }
+        }
+
         public override SpriteFont Font
         {
             set