Add pocket/bag count

Rename Pocket1/Pocket2 to Bag/Pocket respectively (bag is slots21-40)

NHSE.WinForms/Subforms/Map/PlayerHouseEditor.cs

@@ -8,7 +8,7 @@ namespace NHSE.WinForms
 {
     public partial class PlayerHouseEditor : Form
     {
-        public readonly PlayerHouse[] Houses;
+        private readonly PlayerHouse[] Houses;
         private readonly IReadOnlyList<Player> Players;
 
         private int Index;