Enable handle-picaxml handler to handle pica/xml not just ppxml

[TobiasNx]

At the moment handle-picaxml only can handle ppxml:

https://metafacture.org/playground/?flux=inputFile%0A%7C+open-file%0A%7C+decode-xml%0A%7C+handle-picaxml%0A%7C+encode-json%28prettyPrinting%3D%22true%22%29%0A%7C+print%0A%3B&data=%3C%3Fxml+version%3D%221.0%22+encoding%3D%22UTF-8%22%3F%3E%0A%3Crecord+xmlns%3D%22http%3A//www.oclcpica.org/xmlns/ppxml-1.0%22%3E%0A++%3Cglobal+opacflag%3D%22%22+status%3D%22%22%3E%0A++++%3Ctag+id%3D%22003@%22+occ%3D%22%22%3E%0A++++++%3Csubf+id%3D%220%22%3E12345X%3C/subf%3E%0A++++%3C/tag%3E%0A++++%3Ctag+id%3D%22021A%22+occ%3D%22%22%3E%0A++++++%3Csubf+id%3D%22a%22%3EEin+Buch%3C/subf%3E%0A++++++%3Csubf+id%3D%22h%22%3Ezum+Lesen%3C/subf%3E%0A++++%3C/tag%3E%0A++++%3Ctag+id%3D%22045B%22+occ%3D%222%22%3E%0A++++++%3Csubf+id%3D%22a%22%3ESpo+1025%3C/subf%3E%0A++++++%3Csubf+id%3D%22a%22%3EBID+200%3C/subf%3E%0A++++%3C/tag%3E%0A++%3C/global%3E%0A%3C/record%3E

But cannot handle pica/xml: https://metafacture.org/playground/?flux=inputFile%0A%7C+open-file%0A%7C+decode-xml%0A%7C+handle-picaxml%0A%7C+encode-json%28prettyPrinting%3D%22true%22%29%0A%7C+print%0A%3B&data=%3C%3Fxml+version%3D%221.0%22+encoding%3D%22UTF-8%22%3F%3E%0A++%3Crecord+xmlns%3D%22info%3Asrw/schema/5/picaXML-v1.0%22+xmlns%3Axsi%3D%22http%3A//www.w3.org/2001/XMLSchema-instance%22+xsi%3AschemaLocation%3D%22info%3Asrw/schema/5/picaXML-v1.0+http%3A//www.oclcpica.org/xml/picaplus.xsd%22%3E%0A++++++%3Cdatafield+tag%3D%22001@%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E0917%3A14-03-05%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22001B%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E0917%3A23-03-05%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22t%22%3E16%3A15%3A13.000%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22001D%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E0917%3A23-03-05%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22001X%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E0%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22002@%22%3E%0A++++++%3Csubfield+code%3D%220%22%3EAau%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22003@%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E481592954%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22004A%22%3E%0A++++++%3Csubfield+code%3D%220%22%3E3774250936%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22011@%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3E2004%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22021A%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3EDer+Hamster%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22d%22%3Eartgerecht+halten%2C+gesund+ern%C3%A4hren%2C+richtig+verstehen%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22h%22%3EPeter+Hollmann%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22028A%22%3E%0A++++++%3Csubfield+code%3D%22d%22%3EPeter%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22a%22%3EHollmann%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22032@%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3E5.+Aufl%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22033A%22%3E%0A++++++%3Csubfield+code%3D%22p%22%3EM%C3%BCnchen%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22n%22%3EGr%C3%A4fe+und+Unzer%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22034D%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3E127+S%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22034M%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3Ezahlr.+Ill%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22036E%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3EMein+Heimtier%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22044K%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3ERatgeber%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22044L%22%3E%0A++++++%3Csubfield+code%3D%22S%22%3E+%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22a%22%3ERatgeber%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22044L%22+occurrence%3D%2201%22%3E%0A++++++%3Csubfield+code%3D%22S%22%3E+%3C/subfield%3E%0A++++++%3Csubfield+code%3D%22a%22%3EHamsterhaltung%3C/subfield%3E%0A++++%3C/datafield%3E%0A++++%3Cdatafield+tag%3D%22045B%22%3E%0A++++++%3Csubfield+code%3D%22a%22%3EXbp+3%3C/subfield%3E%0A++++%3C/datafield%3E%0A%3C/record%3E