LOADUI-989 Isolated loadui-soapui-plugin from depending on loadui-fx-interface. Used OSGi to publish the dependency of the generic FilePicker and Inject it into soapuiSamplerComponent.
LOADUI-989 Minor refactoring and cleaning
LOADUI-989 fixed a minor bug with Dialog not disappearing on setting the path.
Minor fix for mac that appearantly cannot handle a nullstring on creation of a File
Merge branch 'next' into bugfix_LOADUI-989 and LOADUI-823