Add default configuration files (#30)

* Add default configuration files

The default configuration files are Common.txt, TrustedDomains.txt, UnsafeDomains.txt and UnsafeFiles.txt in `{app}\DefaultConfig`.
Those files are installed when they are located in the "DefaultConfig" folder that exits in the same folder to installer like below.

```
│  FlexConfirmMailSetup-22.6.0.exe
│
└─DefaultConfig
        Common.txt
        TrustedDomains.txt
        UnsafeDomains.txt
```

The configurations in the policy configuration and the default configuration files for trusted domains, unsafe domains and unsafe files
are fixed, they can't modified by user configuration files.
The priority of common configurations is as following.

User file configurations > Default file configurations > Policy configurations

* Bump version to 22.7.0

* add a new line

* Remove a needless using

Config/Const.cs

@@ -8,6 +8,11 @@ public class RegistryPath
         public static readonly string Policy = @"SOFTWARE\Policies\FlexConfirmMail";
     }
 
+    public class ConfigPath
+    {
+        public static readonly string DefaultConfigDirName = @"DefaultConfig";
+    }
+
     public enum ConfigOption
     {
         CountEnabled,

Config/StandardPath.cs

@@ -1,5 +1,4 @@
 using System;
-
 using System.IO;
 
 namespace FlexConfirmMail
@@ -10,6 +9,12 @@ public static string GetUserDir()
         {
             string appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
             return Path.Combine(appData, Global.AppName);
+        }
+
+        public static string GetDefaultConfigDir()
+        {
+            string dllDirectory = AppDomain.CurrentDomain.BaseDirectory;
+            return Path.Combine(dllDirectory, ConfigPath.DefaultConfigDirName);
         }
     }
 }

Dialog/ConfigDialog.xaml.cs

@@ -11,7 +11,7 @@ namespace FlexConfirmMail.Dialog
     public partial class ConfigDialog : Window
     {
         Config _config = new Config();
-        Config _default = new Config();
+        Config _default = new Config();
         Config _local = new Config();
 
         public ConfigDialog()
@@ -24,7 +24,10 @@ public ConfigDialog()
             {
                 _default = Loader.LoadFromReg(RegistryPath.DefaultPolicy);
                 _config.Merge(_default);
-            }
+            }
+            Config defaultWithFile = Loader.LoadFromDir(StandardPath.GetDefaultConfigDir());
+            _default.Merge(defaultWithFile);
+            _config.Merge(defaultWithFile);
 
             _local = Loader.LoadFromDir(StandardPath.GetUserDir());
             _config.Merge(_local);

FlexConfirmMail.iss

@@ -1,9 +1,9 @@
 [Setup]
 AppName=FlexConfirmMail
 AppVerName=FlexConfirmMail
-VersionInfoVersion=22.6.0
+VersionInfoVersion=22.7.0
 AppPublisher=ClearCode Inc.
-AppVersion=22.6.0
+AppVersion=22.7.0
 UninstallDisplayIcon={app}\fcm.ico
 DefaultDirName={commonpf}\FlexConfirmMail
 ShowLanguageDialog=no
@@ -42,8 +42,9 @@ Source: "bin\Release\FlexConfirmMail.dll"; DestDir: "{app}"; Flags: ignoreversio
 Source: "bin\Release\FlexConfirmMail.dll.manifest"; DestDir: "{app}"; Flags: ignoreversion
 Source: "bin\Release\FlexConfirmMail.vsto"; DestDir: "{app}"; Flags: ignoreversion
 Source: "bin\Release\en\FlexConfirmMail.resources.dll"; DestDir: "{app}\en"; Flags: ignoreversion
-Source: "bin\Release\zh\FlexConfirmMail.resources.dll"; DestDir: "{app}\zh"; Flags: ignoreversion
+Source: "bin\Release\zh\FlexConfirmMail.resources.dll"; DestDir: "{app}\zh"; Flags: ignoreversion
 Source: "bin\Release\es\FlexConfirmMail.resources.dll"; DestDir: "{app}\es"; Flags: ignoreversion
 Source: "bin\Release\Microsoft.Office.Tools.Common.v4.0.Utilities.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "bin\Release\Microsoft.Office.Tools.Outlook.v4.0.Utilities.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "Resources\fcm.ico"; DestDir: "{app}"; Flags: ignoreversion
+Source: "{src}\DefaultConfig\*.txt"; DestDir: "{app}\DefaultConfig"; Flags:external skipifsourcedoesntexist

Global.cs

@@ -5,7 +5,7 @@ namespace FlexConfirmMail
     public class Global
     {
         public static readonly string AppName = "FlexConfirmMail";
-        public static readonly string Version = "22.6.0";
+        public static readonly string Version = "22.7.0";
         public static readonly string Edition = "Enterprise";
         public static readonly bool EnableGPO = true;
     }

ThisAddIn.cs

@@ -3,7 +3,7 @@
 using System.Windows.Media;
 using System.Windows.Interop;
 using Outlook = Microsoft.Office.Interop.Outlook;
-using System.Collections.Generic;
+using System.Collections.Generic;
 
 namespace FlexConfirmMail
 {
@@ -158,7 +158,8 @@ private bool DoCheck(Outlook.MailItem mail)
             if (Global.EnableGPO)
             {
                 config.Merge(Loader.LoadFromReg(RegistryPath.DefaultPolicy));
-            }
+            }
+            config.Merge(Loader.LoadFromDir(StandardPath.GetDefaultConfigDir()));
             config.Merge(Loader.LoadFromDir(StandardPath.GetUserDir()));
 
             List<RecipientInfo> originalRecipients = GetOriginalRecipientsFromDictionary(mail.EntryID);