Admin: provide a function to send out final confirmation mails to at most 50 applicants that paid properly

[ottlinger]

An admin can trigger a final confirmation mail to be sent out for all applicants in state BOOKED and no entry in booked-Timestamp column to prevent double mailings!

A mass email is sent out to all applicants confirming their seminar booking:

• room number (if empty: ohne Unterkunft)

• week to the applicant and a short confirmation is sent internally.

• [x] create status BOOKED

• [x] BOOKED should trigger a mail and persistence of booked Timestamp

  • ApplicantStateChanger
  • ConfirmationMailer

• [x] create view db_applicantsConfirmationMail.php

• [x] Create database interaction service (extend Base....) / StateChanger?!

• [x] limit to 50 applicants to prevent ISP blocking mails https://wiki.goneo.de/max-empfaenger

• [x] provide meaningful mail text

  • German
  • English

• [x] BookingDatabaseReader with tests

  • read booked rooms

• print 'unknown/unbekannt' if none exist

[ottlinger]

Deployed with new release v1.1.0