Feature/performance optimizations light #4590
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This PR fixes three memory leaks:
xhrobject were not cleared after a stream switch, but only when a stream object rotated out of the DVR window.SourceBufferSinkwere not cleared. This lead to chunk data being persisted.BolaRulekept references toRepresentationobjects of previous periods.In general, the memory consumption for large multiperiod MPDs oscillates because of preloading upcoming periods. In the long term the memory consumption should be stable though except for the issue described in #4561