mp4sys: Print descriptors in consideration in order.
print: Fix unprinted version and flags of 'nmhd'.
read: Remove improper lsmash_free().
mp4sys: Remove a check of the existence of decSpecificInfo.

The existence of decSpecificInfo depends on streamType and
objectTypeIndication.
print: Support dumping of MpegSampleEntry.
sample: Set 0 to MS2B of 'sdtp' when compatible with both AVCFF exts and QTFF.
importer: Log when failed to open the importer.
importer: 'const static' -> 'static const'.
box: Move the definition of lsmash_box_class.
configure: Add version string to pkg-config file

Use version plus revision: "Version: 1.13.8 rev.1041"
If revision is 0 (= if the .git dir is missing) use only version: "Version: 1.13.8"
Makefile: No need to make shared libs executable on Linux

>Shared libraries should not be installed executable, since the dynamic linker does not require this and trying to execute a shared library usually results in a core dump.

https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#s-sharedlibs-runtime
configure: Update the URL within the pkg-config file.
ac3: Apply refined bytestream reader.
ac3: Fix lsmash_setup_ac3_specific_parameters_from_syncframe().
importer: Fix improper class for an error log.
bstream: Update 'written' when seeking or reading.
ac3: Align bits at the end of parsing syncframe header.
utils: Add 'log_level' which indicate level to determine print of log.
eac3: Fix a typo of the format specifier for chan_loc value.
eac3: Apply refined bytestream reader.