Separate Actions QWidget and reuse it in other QWidgets instance

[algorys]

ActionsQwidget is currently hold by problems.py.

This widget should be used by other QWidget classes who need "acknowledge" and "downtime" buttons. It will also avoid the duplicate code.

• [x] HostQWidget

• [x] ServiceDataQWidget

• [x] Move ActionsQWidget in commons package

[algorys]

Done.