feat(grandexchange): add UNAVAILABLE slot type to EGESlotType enum

Author: Pauwelz

osrs/interfaces/mainscreen/grandexchange/grandexchange.simba

@@ -33,7 +33,7 @@ EGESlotType = enum(EMPTY, SELL, BUY);
 ```
 Enum to represent the type of Grand Exchange offer slot.
 *)
-  EGESlotType = enum(EMPTY, SELL, BUY);
+  EGESlotType = enum(EMPTY, SELL, BUY, UNAVAILABLE);
 
 (*
 ## TRSGrandExchangeSlot
@@ -164,7 +164,11 @@ begin
   //no need for ocr, color count is lighter and should work fine.
   count := Target.CountColor(RSFonts.ORANGE, 0, Self.Header);
   case count of
-    154: Result := EGESlotType.EMPTY;
+    154:
+        if Target.HasColor($6082AB, 0, 1, Self.BuyButton) then
+          Result := EGESlotType.UNAVAILABLE
+        else
+          Result := EGESlotType.EMPTY;
     90:  Result := EGESlotType.SELL;
     101: Result := EGESlotType.BUY;
   end;