Fix: #2759, fix #2761 - add tree to registration notification emails

Fix: #2759 - missing parameter in registration email template

Fix: #2757 - missing tree parameter on shared note page

Fix error updating account preferences; use constants for preference names

Working on #2737 - refactor admin/media controller

Fix: #2740 - undefined variable in media-page template

Refactor update-places to use post+get and new routes

Refactor user-cleanup to use post+get and new routes

Update routing in merge-records

Fix: #2479 - admin manage media showing wrong files; Attach filesystems to request

Use POST+GET for unconnected individuals

Fix: #2623 - auto-delete families with one member is not working

Fix: workflow for accepting pending changes in other trees

Add privacy-policy/impressum - #2654

Add ability to send test messages from email preferences page

Improve logic when masquerading as another user

Fix: #2709 - download GEDCOM using ugly URLs

DeadCode

Fix: #2719 cannot send messages using ugly urls; refactor controller as request handlers

TCPDF does not work on PHP >=7.4

Refactor controllers as request handlers

Refactor controllers as request handlers

Refactor controllers as request handlers

Missing tree parameter in repository page. Refactor controllers as request handlers

Fix: missing parameter on gedcom record page; Refactor controller as handler