contrib: move Base32 implementation to own subdir

(cherry picked from commit 4fc57390)

src/opnsense/mvc/app/library/OPNsense/Auth/LocalTOTP.php

 <?php
+
 /**
  *    Copyright (C) 2015 Deciso B.V.
  *
@@ -29,7 +30,7 @@
 
 namespace OPNsense\Auth;
 
-require_once("Base32.php");
+require_once 'base32/Base32.php';
 
 /**
  * RFC 6238 TOTP: Time-Based One-Time Password Authenticator

src/www/system_usermanager.php

@@ -28,8 +28,9 @@
     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     POSSIBILITY OF SUCH DAMAGE.
 */
-require_once("guiconfig.inc");
-require_once("Base32.php");
+
+require_once 'guiconfig.inc';
+require_once 'base32/Base32.php';
 
 function get_user_privdesc(& $user)
 {