Feature Request: Ticket creation - Move to the new modal + Allow selecting a client and then a contact from main tickets.php (ajax)

[wrongecho]

As a whole, we should move the main tickets.php new ticket modal to the "newer" modal (the one shown when editing a ticket, and in the new recurring ticket modal).

This will allow us to allow selecting a client AND a contact.

We should also allow the ability to control whether a notification email is sent to the contact. This would be pre-ticked based on the value of $config_ticket_client_general_notifications

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We have this behavior on the recurring tickets add modal, but not the main clients. Need to copy this across.