Add support for confirming unsafe addresses

[HashidaTKS]

Add support to specify unsafe addresses.

If a unsafe domain entry contains "@", we regard it as address, not domain.

When an address matches an unsafe addresses rule, a warning "[警告] 注意が必要なアドレス（{0}）が宛先に含まれています。" is displayed as below.

For the domains case, a warning is "[警告] 注意が必要なドメイン（{0}）が宛先に含まれています。" as below.

Note that warnings are displayed for each addresses, so if rules match a lot of addresses, a lot of warnings are displayed.
In case of domains, warnings are displayed per domain, so there are not so many warnings usually.

Test

• Remove files in %APPDATA%\FlexConfirmMail if exist.
• Open Outlook and open setting dialog for FlexConfirmMail
• Open the "注意が必要なドメイン" tab of the setting dialog.
  • Confirm that the comment have description for how to specify addresses like below ...OK

    # (5) ドメインだけでなくアドレス全体を指定することもできます。
    #     * @を含む場合はアドレスが指定されたとみなします。
    #     * @を含まない場合はドメインが指定されたとみなします。
    #
    

• Add entries as following to the "注意が必要なドメイン" setting

  test@a.co.jp
  *test@b.co.jp
  -*test@c.co.jp
  test2@*
  test.co.jp
  

• Try to send mail to test@a.co.jp and test3@a.co.jp （test for test@a.co.jp）
  • Confirm that test@a.co.jp is in "添付ファイル/その他の警告" ...OK
  • Confirm that test3@a.co.jp is not in "添付ファイル/その他の警告" ...OK
• Try to send mail to test-test@a.co.jp and test-test@b.co.jp (test for *test@b.co.jp)
  • Confirm that test-test@b.co.jp is in "添付ファイル/その他の警告" ...OK
  • Confirm that test-test@a.co.jp is not in "添付ファイル/その他の警告" ...OK
• Try to send mail to test-test@a.co.jp and test-test@c.co.jp (test for -*test@c.co.jp)
  • Confirm that test-test@a.co.jp and test-test@c.co.jp are not in "添付ファイル/その他の警告" ...OK
• Try to send mail to test2@a.co.jp and test2@c.co.jp (test for test2@*)
  • Confirm that test2@a.co.jp and test2@c.co.jp are in "添付ファイル/その他の警告" ...OK
• Try to send mail to test-test@test.co.jp and test-test@a.co.jp (test for test.co.jp, domain case)
  • Confirm that test.co.jp is in "添付ファイル/その他の警告" ...OK
    • The message shoud be "[警告] 注意が必要なドメイン（test.co.jp）が宛先に含まれています。"
  • Confirm that test-test@a.co.jp is in not "添付ファイル/その他の警告" ...OK

[piroor]

I've seen codes and its actual behavior and confirmed it works as expected. This looks good to merge.