The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.
In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.
This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.
Json use an utf8 parser from a third party library, switch to
our implementation of php_next_utf8_char.
This also helps on solving #63520. All the unit tests succeed.
Our implementation also seems a little faster.
json.dsp need to be regenerated.
