prefix all new methods with _hx_

change prod user assignment forms to filter groups

fix htmx mailer subview
add appropriate permissions to stream view and proofs

fix re-promoting deactivated prod officer

add my timesheet dedicated page

homogenise change property field names

Authors will now be able to attach files to
their feedback form for the proofs sent by the production
team. The attachment is linked to the ProductionEvent that
is created with the feedback.