Currently the summary and description in event ics file generation are set directly, with a condition in case the event is an appointment. We make these two ics 'fields' use a getter so that it can be overriden inside appointment instead. In addition we remove the special formater for 'online events' as it is only used for appointments, which does not use it anymore as of this task task-3232952 closes odoo/odoo#116211 Related: odoo/enterprise#38570 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>