As we do not appear to have access to a good DTD validation library in
Node.js, we will instead convert the DTD to a JSON schema file and use
that for validation.
I have not verified every aspect of the JSON schema at this point, but
will incrementally do so as I implement further aspects of the compiler.
This updates all the testing to use the schema. As the schema validation
is slow, I have increased the 'normal' time for tests.
Relates to #799.
Removes NRSIAllTags, alltags.txt, parser and utility units.
Also re-enables standardsdata.dpr unit test which needed some syntax
cleanup.
This will be used for future updates for language search
and installation and will eventually allow us to remove
ethnologue and alltags data (and some of bcp47 subtag)
