[REF] event: improve (and fix) default email templates

RATIONALE

Events are sometimes held online, gathering a community. In this merge we
improve Event application to better support full-online events with improved
tracks, wishlists, chat rooms, ...

PURPOSE

Prepare Event Online support by providing fixes in registration and event
frontend flows. Also provide a quick back2basic in backend views to prepare
addition of Online sub modules.

SPECIFICATIONS: CONFIRMATION / REMINDER EMAIL

Reorder a bit content: add links to add to calendar directly in header
text, between confirmation and signature.

Add a section holding a link to PWA in order to showcase it to customers.

Apply fixes :

  * correctly use 50% width only for date / location display when location
    is not set;
  * correctly put jinja tags to make valid html, otherwise edit / save template
    breaks it when browse move jinja tags a bit randomly (e.g. %if between
    tr tag is not valid html and broken by design);
  * correctly compute horizontal separation lines, display them only when there
    is actually some content to separate;
  * correctly support organizer / no organizer, address / no address and
    online / not online in all template;

Notes: this require to re-generate the whole translations templates of both
templates but this seems a required pain. Indeed current template are broken
beyong redemption.

Fixes notably cfca2bb0ffa8a16aeafa3c4114c7f731ee0c87d9

LINKS

Community PR odoo/odoo#55197
Enterprise PR odoo/enterprise#12113

Task ID-2309702 (Event Preparatory Merge 4)
Prepares Task ID-2252655 (Main Online Event task)
Prepares Task ID-2283796 (Event B2Basics / Registration Flow)
Prepares Task ID-2299857 (Event Design Review)

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