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In order to improve our ability to distinguish operations that had already started from others under high loads, it would be nice to know if an application layer (stream) has started to work with an endpoint or not. The use case typically is a frontend mux instantiating a stream to instantly cancel it. Currently this info will take some time to be detected and processed if the applcation's task takes time to wake up. By flagging the sedesc with SE_FL_APP_STARTED the first time a the app layer starts, the lower layers can know whether they're cancelling a stream that has started to work or not, and act accordingly. For now this is done unconditionally on the backend, and performed early in the only two app layers that can be reached by a frontend: process_stream() and process_hstream() (for haterm).