Odoo Release Updates

[IMP] web: improve audio file support

[REF] mail, im_livechat: call _add_members with users when possible

[IMP] website: display deleted url in referencing pages

[REF] mail: clean up TestChannelRTC

[PERF] tools: optimize hook dispatch (`safe_eval`)

[IMP] core: disallow PYTHONOPTIMIZE

[IMP] hr_payroll: update payslip search group by options

[IMP] sale_planning : added danger icon to shift with cancelled SO

[FIX] html_editor: fix toggle list button style

[FIX] html_editor: fix Ctrl+A when first node is non-editable

[FIX] html_editor: keyboard selection across non-editable toggle blocks

[PERF] html_editor: layout trashing in updatePlaceholders

[PERF] html_editor: improve normalize_handlers performance

[PERF] html_editor: improve performance of normalizeLink

[PERF] html_editor: improve performance of mergeAdjacentInlines

[PERF] html_editor: improve performance of normalize of ListPlugin

[PERF] html_editor: improve performance of updatePlaceholders

[PERF] html_editor: improve performance of normalizeDivBaseContainers

[PERF] html_editor: normalizeInline qweb nodes

[IMP] sale_subscription: extract constraint at upsell confirmation

[FIX] sale_subscription: avoid ZeroDivisionError

[FIX] stock_barcode: use contextual company in barcode main menu

[FIX] hr_attendance_gantt: adapt expected hours on flex schedule

[FIX] resource: adapt expected hours on flex schedule with time zones

[IMP] l10n_be_hr_payroll: add nis code to countries and beglian cities

[IMP] web,*: follow up for M3.1 style commit

[IMP] web,*: follow up for M3.1 style commit

[IMP] spreadsheet_edition: generalize PivotModelFieldSelector

[IMP] *_spreadsheet_*: rename `ODOO.LIST` to `ODOO.LIST.VALUE`

[IMP] *_spreadsheet_*: Introduce dynamic lists functions