Can SSDT deploy SQL server service broker objects? Can SQL Server Data Tools (SSDT) deploy sql server broker objects? (So contacts, message types, services, queues and so on.)
It would appear so. I have not tried these, but the following is the list of items that can be added to an SSDT SQL Server Database Project:


Broker Priority
Contract
Endpoint (ServiceBroker over TCP)
Endpoint (SOAP over HTTP)
Event Notification
Message Type
Queue
Remote Service Binding
Route
Service