Phonebox-plugin

Fix Filters for NetBox 3.X

Provide general compatibility with NetBox 3.X

Add filtering Numbers by Provider support.

NetBox 2.11.3-2.11.4 support and API serializer fix.

Quickfix for NetBox v2.11+ support.

**Implement Bulk Numbers Import**.
PhoneBox Plugin now supports Numbers import from CSV.
Import button is available on a Numbers list view page ().
Direct Import Numbers page link is .