Odoo Release Updates

[IMP] *: remove unnecessary button "Discard" labels

[FIX] databases: prevent error on uninstalling databases

[FIX] databases: ensure value in non-stored many2many compute method

[IMP] databases: correct app icon according to guidelines

[IMP] orm: use SQL alias for Field.compute_sql

[IMP] databases: properties definition field_to_sql

[FIX] databases: remove superfluous /json/2 arguments

[CLN] *: manifests

[FIX] databases: disable write action on database_user_ids

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

[IMP] *: crud options become attrs