#2076 - Remove JAXB as dependency of ebean-api

- Move JAXB detection to ebean-ddlgen
- JAXB as test dependency of ebean-core

ebean-core/src/main/java/io/ebeaninternal/server/core/InternalConfiguration.java

@@ -216,10 +216,6 @@ public class InternalConfiguration {
   }
 
   private List<XmapEbean> readExternalMapping() {
-    //TODO: Remove the isJavaxJAXBPresent() check once this is external module
-    if (!config.getClassLoadConfig().isJavaxJAXBPresent()) {
-      return Collections.emptyList();
-    }
     final XmapService xmapService = config.service(XmapService.class);
     if (xmapService == null) {
       return Collections.emptyList();