mp3 importer: allow ID3/APE tag existence
mp3 importer: parse Xing/Info/VBRI header and skip it
mp3 importer: Don't export AudioSpecificConfig.

No decSpecificInfo is defined for the legacy interface to MPEG-1 Audio and MPEG-2 Audio.
utils: Split {byte|bit|buffer}-stream stuff into separate files.
utils: Split list stuff into separate files.
utils: Split memory allocation stuff into separate files.
utils: Move stuff unrelated to box into common directory.
codecs: Move codec specific stuff into codecs directory.
core: Move fundamental muxing/demuxing stuff into core directory.
cli: Move CLI stuff into cli directory.
Makefile: Fix make clean because of moving source files.
bstream: Make lsmash_bs_alloc() static.
lib: Add parentheses to LSMASH_VERSION_INT macro.
configure: Fix out-of-tree build.
osdep: Suppress gcc warnings.
box: Suppress gcc warning.
file: Treat stdin as unseekable.
fragment: Fix writing number_of_entry of 'tfra' when removing entries.
fragment: Fix writing entries of 'tfra' when ISOM_EDIT_DURATION_IMPLICIT.
file: Fix error handling of fread_wrapper().