Merge in RED/pdftron-logic-commons from RED-4875_2 to master
* commit '46f3b74cb560e34bf6ec08d1ed430b193125e0ad':
RED-4875 - close pdfdoc in finally and add UtilityClass annotation for class PdfTextExtraction
RED-4875 - added '.' in javadoc
RED-4875 - remove spring boot in pom and add a javadoc-link
RED-4875 - remove method and add delta do call with pdfdpc
RED-4875 - first implementation of hasInvisibleText()
RED-4875 - move destroy of pdftron-elements out of loop
RED-4875 - add possibility to call if with pdfdoc-object
RED-4875 - move PdfTextExtraction.java from ocr-service to here
RED-4875 - some refactoring and adding log
RED-4875 - refactored code so it can get called with both, pdfdoc and in/output-steams
RED-4875 - add import for docker-config
RED-4875 - added Docker config again and deleted JUnit Resultparser
RED-4875 - delete docker config