Odoo Release Updates

[REF] mail, web, *: replace deprecated asyncStep() in tests

[FIX] web: tests - allow custom responses in onRpc

[REM] calendar: remove useless portal attendee ACL and ir.rule

[CLN] *: manifests

[FIX] *: automaticaly set legacy at_install

[FIX] calendar: calendar attendee access token missing groups

[FIX] calendar: add activity feedback to notes field, not description

[IMP] calendar: user default privacy is writeable

[REF] all: model's description should be singular

[IMP] web,*: reduce TagsList overrides

[REF] *: use ir.config_parameter new API get_xxx, set_xxx

[IMP] base,all: remove deprecated 't-esc' ir.qweb directive

[IMP] web, calendar: make useSpecialData offline-proof

[IMP] mail, *: allow users to post to readonly chatter

[FIX] calendar: consider email_from field of template

[REF] *: cleanup legacy test helpers

[IMP] orm: prevent use of falsy ids

[FIX] calendar: compute stop date when updating start in quick-edit

[FIX] calendar: bring back calendar event deletion wizard

[IMP] web: remove calendar attribute "date_delay"

[FIX] calendar: fix status help typo

[IMP] *: improve UI of the preference form and the user form for admin

[IMP] crm: improve CRM usage: rainbowman, assign, stages, ...

[IMP] calendar: redesign calendar event quick create

[IMP] calendar: ensure attendee calendar without filters