Avoid warnings
- No longer use deprecated SWTObservableUtils
- Do not use IObservableValue as raw type
(from redmine: issue id 3569, created on 2018-11-06, closed on 2018-11-13)
- Relations:
- parent #3538 (closed)
(from redmine: issue id 3569, created on 2018-11-06, closed on 2018-11-13)