WIP: refactoring xml serialization

CHANGELOG.md

pom.xml

...caosdb/server/converter/xml/EntityXMLConverterHelper.java

src/main/java/caosdb/server/converter/xml/XMLParser.java

.../java/caosdb/server/entity/container/DeleteContainer.java

...a/caosdb/server/entity/container/EntityByIdContainer.java

.../java/caosdb/server/entity/container/InsertContainer.java

...ava/caosdb/server/entity/container/RetrieveContainer.java

.../caosdb/server/entity/container/TransactionContainer.java

.../java/caosdb/server/entity/container/UpdateContainer.java

...ava/caosdb/server/entity/container/WritableContainer.java

.../caosdb/server/resource/AbstractCaosDBServerResource.java

...n/java/caosdb/server/resource/AuthenticationResource.java

src/main/java/caosdb/server/resource/DefaultResource.java

...main/java/caosdb/server/resource/EntityOwnerResource.java

src/main/java/caosdb/server/resource/FileSystemResource.java

src/main/java/caosdb/server/resource/InfoResource.java

src/main/java/caosdb/server/resource/JdomRepresentation.java

src/main/java/caosdb/server/resource/LogoutResource.java

.../java/caosdb/server/resource/PermissionRulesResource.java