[IMP] energy_selfconsumption: invoicing energy delivered

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Changelog

• [IMP] energy_selfconsumption: new wizard invoicing_wizard to manually generate the invoices for the energy delivered selfconsumption projects.
• [IMP] energy_selfconsumption: action to invoice energy delivered contracts, can only be applied to the same period (start and end)
• [IMP] energy_selfconsumption: view of contracts grouped by period (start and end)
• [IMP] energy_selfconsumption: contract io.cron will not get contracts related to energy delivered projects.
• [IMP] energy_selfconsumption: contract.contract will now save last period invoiced.

energy_selfconsumption/wizards/invoicing_wizard.py

@@ -6,7 +6,7 @@ class InvoicingWizard(models.TransientModel):
     _name = "energy_selfconsumption.invoicing.wizard"
 
     power = fields.Float(string="Total Energy Generated (kWh)")
-    contract_ids = fields.Many2many("contract.contract")
+    contract_ids = fields.Many2many("contract.contract", readonly=True)
 
     @api.constrains("contract_ids")
     def constraint_contract_ids(self):