Use XPathProcessor for all remaining XPath operations

The XPathContextualizer class is only kept to provide utility method
to box and unbox XPath strings into PathExpression instances, and just
uses XPathProcessor from eforms-core-java.

Remove the XPathContextualizerTest class, as all those unit tests are
now unit tests of XPathProcessor.

src/main/java/eu/europa/ted/efx/sdk1/xpath/XPathScriptGeneratorV1.java

@@ -2,10 +2,11 @@
 
 import eu.europa.ted.eforms.sdk.component.SdkComponent;
 import eu.europa.ted.eforms.sdk.component.SdkComponentType;
+import eu.europa.ted.eforms.xpath.XPathInfo;
+import eu.europa.ted.eforms.xpath.XPathProcessor;
 import eu.europa.ted.efx.interfaces.TranslatorOptions;
 import eu.europa.ted.efx.model.expressions.path.PathExpression;
 import eu.europa.ted.efx.model.types.EfxDataType;
-import eu.europa.ted.efx.xpath.XPathContextualizer;
 import eu.europa.ted.efx.xpath.XPathScriptGenerator;
 
 @SdkComponent(versions = {"1"}, componentType = SdkComponentType.SCRIPT_GENERATOR)
@@ -40,7 +41,8 @@ public XPathScriptGeneratorV1(TranslatorOptions translatorOptions) {
      */
     @Override
     public PathExpression composeFieldValueReference(PathExpression fieldReference) {
-        if (fieldReference.is(EfxDataType.MultilingualString.class) && !XPathContextualizer.hasPredicate(fieldReference, "@languageID")) {
+        XPathInfo xpathInfo = XPathProcessor.parse(fieldReference.getScript());
+        if (fieldReference.is(EfxDataType.MultilingualString.class) && !xpathInfo.hasPredicate("@languageID")) {
             return PathExpression.instantiate("efx:preferred-language-text(" + fieldReference.getScript() + ")", fieldReference.getDataType());
         }
         return super.composeFieldValueReference(fieldReference);