[12.0][IMP] - add new option: create_new_line_at_contract_line_renew

Add a company config option to decide whether to create or to extend contract
line at renew action

contract/__manifest__.py

@@ -34,6 +34,7 @@
         'views/contract_template.xml',
         'views/contract_template_line.xml',
         'views/res_partner_view.xml',
+        'views/res_config_settings.xml',
     ],
     'installable': True,
 }