Netbox-contract

* [140](https://github.com/mlebreuil/netbox-contract/issues/140) Add the "Invoice line" and "Accounting dimension" models. In order to simplify invoices creation, it is possible to selsct one invoice as the template for each contract; Its accounting lines will automatically be copied to the new invoices for the contract. The amount of the first line will be updated so that the sum of the amount for each invoice line match the invoice amount.

* [127](https://github.com/mlebreuil/netbox-contract/issues/135) Fix service provider creation issue
* Fix contract assignement issue

* Netbox v4 compatibility. Netbox4.0.2 become a minimum requirement

* [127](https://github.com/mlebreuil/netbox-contract/issues/127) Fix contract filtering
* Fix contact assignement.

* [123](https://github.com/mlebreuil/netbox-contract/issues/123) prepare plugin to [Netbox 4.0 migration](https://docs.netbox.dev/en/feature/plugins/development/migration-v4/).
* [125](https://github.com/mlebreuil/netbox-contract/issues/125) Cleanup direct reference to Circuits in the Contract model. Correct database inconsistencies related to the ContractAssignment object renaming.

* [115](https://github.com/mlebreuil/netbox-contract/issues/115) API correction for contract external partie
* [117](https://github.com/mlebreuil/netbox-contract/issues/117) Tenant and accounting dimensions optional
* [119](https://github.com/mlebreuil/netbox-contract/issues/119) Add a Yearly recuring cost, read only, calculated field for contract
* [15](https://github.com/mlebreuil/netbox-contract/issues/105) Quick serach limited to active contracts