Odoo Release Updates

[REF] mail: activities use user_id rather than persona

[IMP] stock_barcode: group package lines

[IMP] point_of_sale, pos_*: improve self order table management

[FIX] mrp_subcontracting: small cosmetic changes

[IMP] crm_enterprise, helpdesk: hide measure `Stage Color`

[IMP] core: bump master release to 19.1 alpha

[IMP] web: list multi edit: display M2M changes in modal

[IMP] hr_payroll: Update employee selection in pay run

[FIX] l10n_sa_hr_payroll: fix payroll field test failure in sa localization

[FIX] account_reports: exchange rate entries in bank reconciliation

[IMP] timesheet_grid: remove dead code

[IMP] account: Move some helpers in another section + merge_tax_details in js

[IMP] mail: use composerHtml for restore

[FIX] hw_drivers: prevent duplicated actions

[FIX] iot: prevent duplicated actions on fallback

[IMP] pos_urban_piper: introduce delivery order reporting

[IMP] website: update some navbar design / fix issues

[FIX] web: burger user menu click doesn't close it

[FIX] ai: do not show ask ai if no responsible ai agent

[IMP] spreadsheet: update o_spreadsheet to latest version

[REF] web_gantt: remove dead code in multi create tests

[IMP] website_slides: require file upload/link for document and image content

[IMP] mass_mailing: reorganize style files

[FIX] mrp_subcontracting: clean code

[FIX] website: fix header alignment and position options

[IMP] mass_mailing: design option for margin bottom on paragraphs and headings

[FIX] pos_enterprise, pos_appointment: dark mode visibility issues

[IMP] pos_mobile: open customer display automatically for next time

[IMP] l10n_test_website_sale: adapt tour_new_billing_ec

[IMP] website: update some header options availability