decoder_api: emulate SEEK command for initial seek to CUE track
When playing a CUE track, the player thread waited for the decoder to become ready, and then sent a SEEK command to the beginning of the CUE track. If that is near the start of the song file, and the track is short enough, the decoder could have finished decoding already at that point, and seeking fails. This commit makes this initial seek more robust: instead of letting the player thread deal with the difficult timings, let the decoder API emulate a SEEK command, and return it to the decoder plugin, as soon as the plugin finishes its initialization.
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Max Kellermann