Odoo Release Updates

[FIX] l10n_pl_edi: enable KSeF auth with encrypted private keys

[FIX] point_of_sale: correct POS receipt tax label after fiscal position

[REM] barcodes: unused `barcode_handler` widget

[FIX] account: prevent error on setting accounting period for tax returns

[FIX] iot_drivers: 1 second delay when reading scale

[FIX] purchase_stock: avoid extra product return during backorder

[FIX] account: allow duplicate code check to include archived accounts

[IMP] mail: refine ChannelActionDialog header spacing

[FIX] mail: filter access on linked messages

[FIX] website_sale: prevent double delivery amount in express checkout

[IMP] account: Do not fetch everything for the cumulated balance

[REM] l10n_it_edi: remove unused request parameter

[REF] *: remap validate function imports

[FIX] hr_holidays: fix demo data for Anita Oliver

[IMP] mail: open avatar card when clicking follower in follower list

[PERF] html_editor: debounce hints and power buttons updates

[IMP] core: bump master release to 19.3 alpha

[MOV] http: move serving outside request

[IMP] l10n_tr_nilvera{_einvoice}: Improvements and bug fixes

[FIX] account: inherit product category accounts from parent hierarchy

[FIX] l10n_my_edi_pos: include all orders for invoice consolidation

[FIX] html_builder: fix undefined error on unselect button

[FIX] pos*: use l10n datetime format

[FIX] mail,account: Fix unathorized error in audit trail

[IMP] html_builder: improve savable area filtering in editor setup

[FIX] hr_holidays: skip disabled calendar slots in tour

[FIX] website: allow copyright bg color when footer has no bg color

[FIX] website, website_sale: avoid timeout dialog actions

[FIX] pos, l10n_ke_edi_oscu_pos: fix timeout on indexed db

[REF] mail: rename the various fetchMessages to avoid confusion