[FEATURE] CellLabelClient can now retrieve all relevant formats (text, styled text, image, font, background, foreground)
[API] CellLabelClient can now also be used as a non thread safe singleton
[FEATURE] FilteredTree now highlights the matched words
[FIX] NebulaPreferences now saves the treePath instead of the expanded elements
[FEATURE] New clicked / doubleClicked event for JointJS
[FEATURE] Multiple links connecting the same elements are now rendered so the links don't overlap