Odoo Release Updates

[FIX] mass_mailing: fix separator title snippet

[FIX] mass_mailing: remove erroneous mass_mailing style

[FIX] mass_mailing: use o_mail_no_colorpicker instead of s_col_no_bgcolor

[FIX] mass_mailing: remove empty containers and sections

[FIX] mass_mailing(_themes): increment mass_mailing snippets vxml

[FIX] mass_mailing: align fontFamilyPicker option

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

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

[FIX] mass_mailing: retry failed emails in batches

[FIX] mass_mailing: fix theme selector favorite template star color

[FIX] mass_mailing: fix html_editor test helpers not present in single app

[FIX] mass_mailing: restore template model-lock

[FIX] html_builder, mass_mailing: fix mass_mailing snippets

[IMP] mass_mailing: remove masonry templates

[FIX] mass_mailing: ensure correct width for processing element

[IMP] mass_mailing: rename mismatched files, classes and registry

[IMP] mass_mailing: remove unused class `o_mail_no_resize`

[FIX] mass_mailing: allow reapplying a background image when removing it

[IMP] mass_mailing: allow converting a s_image which is a snippet descendant

[IMP] html_builder: allow empty `applyTo` for addProductOption

[FIX] mass_mailing: fix mass_mailing snippets

[REF] html_editor: split color plugin in two

[IMP] mass_mailing: fix mobile preview

[REF] html_builder, *: update `assets_edit_frontend` bundle name

[IMP] mass_mailing: sort out style assets to reduce loading time

[FIX] mass_mailing, html_editor: mass_mailing refactoring follow up

[IMP] html_editor, mail, mass_mailing: add option to allow checklist

[IMP] mass_mailing: fix scrolling during drag&drop

[FIX] mass_mailing: update html_builder asset inclusion

[IMP] mass_mailing: improve onboarding in an empty email