Odoo Release Updates

[FIX] sale_pdf_quote_builder: prevent error when uploading invalid pdf file

[FIX] mail: show reply context for attachment-only messages

[FIX] website: add fullscreen loader when loading more themes

[REF] web: Hoot - unify imports

[FIX] web: statusbar field: update value if it changed

[FIX] website: use tour helper to switch website

[IMP] hr_skills: add certificates uploading for certifications

[FIX] base: new version of the build-breaking i18n test

[FIX] website_event: quote the url in event descriptions

[FIX] website: fix carousel id duplication

[FIX] stock_delivery: propagate delivery carrier in pickings

[FIX] web: Hoot - allow diff for circular objects

[REF] web: make Dropdown event handler cleaner

[IMP] mail: remove allChannels field

[FIX] html_editor, mass_mailing, website: fix background repeat pattern

[FIX] website: use the correct cache key for _get_page_info

[FIX] base: i18n test disables following tests in CI

[FIX] html_editor: image toolbar not opening after editable loses focus

[FIX] website: fix the highlight effects in content Preview

[FIX] l10n_nl: Correct default deferred accounts

[IMP] hr: moving Mitchell Admin to demo data

[FIX] account,sale: Fix too much lines when cumulating global discounts

[FIX] html_builder: fix condition for default image mimetype

[FIX] sale, account: remove padding on non section lines

[FIX] website_slides: fix fullscreen title

[IMP] event_sale: Do not confirm registrations for paid events when the sale is confirmed.

[IMP] spreadsheet: update o_spreadsheet to latest version

[FIX] mail: mark messages as read when fetching mails

[IMP] website_sale_collect: allow selling when out of stock

[IMP] account, sale(_management): add section state widget