Enhanced Permission Checks in GenericInterface Ticket Connector.

Conflicts:
	CHANGES.md
	Kernel/GenericInterface/Operation/Ticket/TicketUpdate.pm
	scripts/test/GenericInterface/Operation/Ticket/TicketCreate.t
	scripts/test/GenericInterface/Operation/Ticket/TicketGet.t
Typo.
Improved tests stability.

Conflicts:
	scripts/test/GenericInterface/Operation/Ticket/TicketGet.t

Conflicts:
	scripts/test/GenericInterface/Operation/Ticket/TicketCreate.t
	scripts/test/GenericInterface/Operation/Ticket/TicketGet.t
	scripts/test/GenericInterface/Operation/Ticket/TicketUpdate.t
Improved test stability.
Re-added possibility to have a custom RSS feed in Agent Dashboard.

-OTRS News Cloud Service call is now moved to DashboardNews module.