RTTM ends too soon when latency > 500ms

[juanmc2005]

Problem

When streaming a file with a certain latency, the system continuously outputs windows [t - latency --> t - latency + step]. When the latency is higher than the step and we reach the end of the file, the remaining audio is ignored and no output is produced.

This problem has already been mentioned in #15.

Idea

Either use zero-padding until we reach time t + latency - step, or detect the end of the file beforehand and output non-aggregated scores.