fix #8333 Show modifiers for states in Character Matrix
ref #7589 Fix multiple selection for categorical data in matrix editor
ref #8242 Refactor states to use DTOs
ref #8242 Show dropdown filter for categorical data
ref #8242 Set max items for dropdown to 10 + sort items
ref #8146 Restrict character matrix to characters
Refactor categorical combo box creation
replace all occurrences of workingSet by descriptiveDataSet and fix some other compile errors after model change