add support for FLAC seektables
Please add support for FLAC seektables, so precise jumps are available in the same way for DVD playback.
davygrvy@kahaluia:/media/Monster/AudioWorkspace/halloween/export$ metaflac --list --block-type=SEEKTABLE halloween2014.flac
METADATA block [#1](https://code.videolan.org/videolan/vlc/-/issues/1)
type: 3 (SEEKTABLE)
is last: false
length: 288
seek points: 16
point 0: sample_number=0, stream_offset=0, frame_samples=1152
point 1: sample_number=16331904, stream_offset=55053979, frame_samples=1152
point 2: sample_number=51765120, stream_offset=197025797, frame_samples=1152
point 3: sample_number=68284800, stream_offset=262079631, frame_samples=1152
point 4: sample_number=86692608, stream_offset=340554267, frame_samples=1152
point 5: sample_number=105155712, stream_offset=411076022, frame_samples=1152
point 6: sample_number=124055424, stream_offset=482269117, frame_samples=1152
point 7: sample_number=148308480, stream_offset=582896770, frame_samples=1152
point 8: sample_number=173957760, stream_offset=690502725, frame_samples=1152
point 9: sample_number=192895488, stream_offset=773630886, frame_samples=1152
point 10: sample_number=223285248, stream_offset=906799428, frame_samples=1152
point 11: sample_number=253673856, stream_offset=1029165188, frame_samples=1152
point 12: sample_number=299037312, stream_offset=1201764415, frame_samples=1152
point 13: sample_number=334372608, stream_offset=1333735694, frame_samples=1152
point 14: sample_number=374519808, stream_offset=1485435292, frame_samples=1152
point 15: sample_number=429293952, stream_offset=1697814797, frame_samples=1152
davygrvy@kahaluia:/media/Monster/AudioWorkspace/halloween/export$