move store classes to new Store namespace

also make them use file-scoped namespace
and get rid of the extra indent

AcceptanceTest/TestBase.cs

@@ -3,6 +3,7 @@
 using System.IO;
 using System.Net;
 using QuickFix.Logger;
+using QuickFix.Store;
 
 namespace AcceptanceTest;
 

Examples/Executor/Program.cs

@@ -5,6 +5,7 @@
 using System.Text;
 using QuickFix;
 using QuickFix.Logger;
+using QuickFix.Store;
 
 namespace Executor
 {

Examples/SimpleAcceptor/Program.cs

@@ -4,6 +4,7 @@
 using System.Text;
 using QuickFix;
 using QuickFix.Logger;
+using QuickFix.Store;
 using QuickFix.Transport;
 
 namespace SimpleAcceptor

Examples/TradeClient/Program.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Text;
 using QuickFix.Logger;
+using QuickFix.Store;
 
 namespace TradeClient
 {
@@ -32,7 +33,7 @@ static void Main(string[] args)
  {
  QuickFix.SessionSettings settings = new QuickFix.SessionSettings(file);
  TradeClientApp application = new TradeClientApp();
- QuickFix.IMessageStoreFactory storeFactory = new QuickFix.FileStoreFactory(settings);
+ IMessageStoreFactory storeFactory = new FileStoreFactory(settings);
  ILogFactory logFactory = new ScreenLogFactory(settings);
  QuickFix.Transport.SocketInitiator initiator = new QuickFix.Transport.SocketInitiator(application, storeFactory, settings, logFactory);
 

QuickFIXn/AbstractInitiator.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System;
 using QuickFix.Logger;
+using QuickFix.Store;
 
 namespace QuickFix
 {

QuickFIXn/Session.cs

@@ -5,6 +5,7 @@
 using QuickFix.Fields;
 using QuickFix.Fields.Converters;
 using QuickFix.Logger;
+using QuickFix.Store;
 
 namespace QuickFix
 {

QuickFIXn/SessionFactory.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using QuickFix.Logger;
+using QuickFix.Store;
 using QuickFix.Util;
 
 namespace QuickFix

QuickFIXn/SessionState.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using QuickFix.Logger;
+using QuickFix.Store;
 using MessagesBySeqNum = System.Collections.Generic.Dictionary<ulong, QuickFix.Message>;
 
 namespace QuickFix