Close all sockets on shutdown

Sources/App/Model/Tables/AbstractTable.swift

@@ -123,6 +123,10 @@ extension AbstractTable: ManageableTable {
         sendUpdateToAllPlayers()
         return
     }
+    
+    func disconnectAllPlayers() {
+        players.forEach { $0.disconnect() }
+    }
 
     func sendUpdateToAllPlayers() {
         players.enumerated().forEach { playerIndex, player in

Sources/App/Model/Tables/ManageableTable.swift

@@ -31,4 +31,6 @@ protocol ManageableTable {
     func disconnect(player name: PlayerName)
 
     func sendUpdateToAllPlayers()
+    
+    func disconnectAllPlayers()
 }