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The modofications solve two problems regarding issues #198 and #202:
#198: modifications in my_bus_callback ensure that after the last URI is played gstreamer is REALLY stopped and that the URI is cleared. modifications in output_gstreamer_play ensure, that no empty URIs are passed to the gstreamer, which leads to problems with bluealsa
#202: prepare_next_stream as answer to "about-to-finish" is no longer used for setting the next URI. This ensures, that only the bus-cb sets the next URI and gstreamer is stopped and started again, which is needed to ensure propper playing of MP3 with different sampling rates.