[fix] update new range xsd with allowed attributes
[fix] update new range xsd with allowed attributes

- new range index’s <create> element may contain @type and @case
- add new conditional combined index feature’s <condition> elements, which may contain @attribute, @operator, @value, @case, and @numeric
- consolidate repeated @case into attributeGroup
- remove @qname from allowed attributes for <field>; only @match is allowed according to documentation

windauer/exist,eXist-db/exist,ambs/exist,ambs/exist,wolfgangmm/exist,lcahlander/exist,windauer/exist,lcahlander/exist,wolfgangmm/exist,olvidalo/exist,dizzzz/exist,windauer/exist,adamretter/exist,wolfgangmm/exist,ambs/exist,wolfgangmm/exist,olvidalo/exist,ambs/exist,lcahlander/exist,eXist-db/exist,lcahlander/exist,eXist-db/exist,lcahlander/exist,olvidalo/exist,adamretter/exist,adamretter/exist,windauer/exist,wolfgangmm/exist,ambs/exist,adamretter/exist,olvidalo/exist,eXist-db/exist,adamretter/exist,dizzzz/exist,dizzzz/exist,dizzzz/exist,windauer/exist,adamretter/exist,dizzzz/exist,windauer/exist,eXist-db/exist,olvidalo/exist,wolfgangmm/exist,dizzzz/exist,ambs/exist,eXist-db/exist,lcahlander/exist