* Fix a parser bug where tokens are misidentified as commas.
In the old and new readers, when parsing an object, a comment
followed by any non-`}` token is treated as a comma.
The new unit test required changing the runjsontests.py
flag regime so that failure tests could be run with default settings.
* Honor allowComments==false mode.
Much of the comment handling in the parsers is bespoke, and does not
honor this flag. By unfiying it under a common API, the parser is
simplified and strict mode is now more correctly strict.
Note that allowComments mode does not allow for comments in
arbitrary locations; they are allowed only in certain positions.
Rectifying this is a bigger effort, since collectComments mode requires
storing the comments somewhere, and it's not immediately clear
where in the DOM all such comments should live.
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Co-authored-by: Jordan Bayles <bayles.jordan@gmail.com>
