[IMP] base: add native support for ir.config_parameter in res.config
[IMP] base: add native support for ir.config_parameter in res.config

Res config currently have some native behavior to support features
like default_XX (setting global default value), group_XX (adding
implied groups) and module_XX (installing or removing modules). This
commit add support of config_parameter attribute on other fields that
automatically links a config parameter to the field. It allows to
hide the set and get of config parameter and their value conversion
as everything is now handled by the base settings class.

Thanks to @rco-odoo for his help and review when working on this
feature.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo