docs: scope composition
docs: scoreClassDiagram + scoreWeightType
docs: scoreFoldingIsBroken
fix image
HardAndSoftScore has been renamed to HardSoftScore
ScoreDefinition.formatScore(Score) + move XstreamProblemIO + javadocs
Some time ago the importers slightly changed the format of the xml files, committing all files under the new format.
rename hardandsoft to hardsoft: also apply in xml files so the tests still run (todo: xml files should not mention the class in the first place)