Trailers: get trailer bindings

To get information about binding/unbinding of a trailer for specified period of time, use the command resource/get_trailer_bindings:

svc=resource/get_trailer_bindings&params={"resourceId":<long>,
					  "unitId":<long>,
					  "trailerId":<long>,
					  "timeFrom":<uint>,
					  "timeTo":<uint>}

Current request can't be executed simultaneously with following requests:

• report/exec_report,
• report/export_result,
• report/get_result_chart,
• report/get_result_map,
• messages/load_interval,
• render/create_messages_layer,
• unit/get_trips,
• resource/get_driver_bindings,
• all requests from chapter Export and import,
• account/get_account_history.

{
	<text>:[{	/* trailer ID */
		"t":<unit>,	/* time of binding/unbinding*/
		"u":<long>	/* unit ID - binding, 0 - unbinding */
	}],
	...
}