refactor(bpmn-data): refactor data sql output logic
refactor(transformation): refactored tranformation handler and input checker based on query creation refactoring
fix(parser): updated parser regarding names of extension tags
fix(transformation): changed dataXML structure
feat(data output): inserted transformation and updating of data object attributes; not shure if it works like that, because we do not have any tests
feat(bpmn-data): add delete statement api
feat(bpmn-data): add 'expression' updates and deletes

- refactored data output handler now is able to handle plain sql
expression sub selects and delete statements
- SqlDerivation test passes