MAPG-142 implemenet confirmation mail resend

database/migrations/structure/20200705_0118_resend_activation.sql

@@ -0,0 +1,5 @@
+UPDATE `user_confirmations` SET token=SUBSTRING(token, 1, 32);
+
+ALTER TABLE `user_confirmations`
+  ADD `last_sent` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  MODIFY `token` varchar(32) CHARACTER SET ascii NOT NULL;