Adapting xmlbf based RDF/XML parser without transformers about rdf4h

[robstewart57]

@wismill are you able to take a look at 4cbd084

It's an adaptation of your xmlbf based XmlParser parser, without use of the monad transformers and the mtl instances.

It introduces 21 failing tests, e.g.

rdfms-rdf-names-use-error-011:                                          FAIL
    Exception: HUnitFailure (Just (SrcLoc {srcLocPackage = "main", srcLocModule = "W3C.W3CAssertions", srcLocFile = "testsuite/tests/W3C/W3CAssertions.hs", srcLocStartLine = 50, srcLocStartCol = 3, srcLocEndLine = 50, srcLocEndCol = 77})) (Reason "parsed unexpectantly:\nRight ")

Which I suspect is because of 4cbd084#diff-5d8dba8a62ef5dc84e43e2f5c27f1f4dR326 :

pAnyElement' :: StateT s Xmlbf.Parser a -> StateT s Xmlbf.Parser a                      
pAnyElement' sp = StateT (pAnyElement . runStateT sp)

Which is an adaptation of pElement' as suggested in https://gitlab.com/k0001/xmlbf/issues/25#note_181675959 .

[robstewart57]

For now, a snapshot of the Xmlbf files, which included the monad transformer, has been directly copied into this repository. See the commentary in the Xmlbf.hs file for details:

https://github.com/robstewart57/rdf4h/blob/master/src/Text/RDF/RDF4H/XmlParser/Xmlbf.hs#L12