backport: [15701],[15702],[15704],[15705],[15707]-[15711],[15733],[15734],[15736],[15741],[15744],[15745],[15753]-[15757],[15762],[15763],[15767],[15774]-[15778],[15781]-[15783],[15785]-[15787],[15790],[15791]

skipped: RTE code and BeOS fixes (if someone could look at [15735] and commit that which does not concern the new playlist, i would be thankful.)