"loaded plugins..." dialog -> insert filtering

[M. Gronle]

Since this dialog is pretty big now, a better filtering (e.g. wildcard-based filtering of the names) or sorting might be good.

[itobiege]

added ignored list and filter edit to dialogLoadedPlugins (close #5)

→ <<cset b15c5f5eb612>>

[M. Gronle]

Closes issue #5: DataIO and actuator plugins now have a user mutex, that can be accessed both by the C++ interface as well as by the Python methods :meth:dataIO.userMutexTryLock, :meth:dataIO.userMutexUnlock, :meth:actuator.userMutexTryLock, :meth:actuator.userMutexUnlock. Plugins must be compiled against the AddInInterface >= 4.2.0 to support this mutex.

→ <<cset bc2a3df0e11a>>