Statechart Editor: Group Properties

1. Add a search field to the proxy list (e.g. is "Control Unit" listed under Armar3, Armar4, RobotAPI or RobotComponents?)

2. Add some hint on what to do if my proxy is not displayed (a small label at the bottom/ a tool tip).

Status changed to closed by commit de52f576

mentioned in commit f19fd043

Mentioned in commit de52f576

Mentioned in commit f19fd043