issue #390 - DEVELOPMENT: Application integration 
http://agalaldev.info/dev/mantis/view.php?id=390

- Removing unneeded filters' constructors
- Removing port type from being displayed in the properties view when a port instance is selected
- Adding protection for calling VideoFilter.process() on null data
- Fixing bug with FiltersLaunchConfigurationTab, where it was caching EMF objects (FilterInstances) which were invalid after their resource is reloaded (on modifications); the fix was basically storing FilterInstance's name as a unique identifier instead of the FilterInstace instance itself