Set oss.sonatype.org as DM

Update dependencies
see #2931
Update license

see #2931
Fix MultiChartPanelTest errors

fixes #2932
Listen to changed from ButtonGroup

fixes #2933
Fix fields tests

see #2931
Remove freepik and reflectionskde4 from the bundle

Because of the limit of 10 MB, see
http://central.sonatype.org/pages/ossrh-guide.html
see #2931