Let targets contain multiple filters

[pobiega]

Targets should be able to have multiple filters and let the user specify if all or just one filter must match,

Suggested implementation:
Create a FilterGroup class that contains several Filters and a FilterStrategy. The group checks the internal filters when a match request is sent, respecting its associated strategy.

• Create FilterGroup and all it's requirements
• Modify UI to allow usage of new functionality (Add target window)
• Refactor the Add target window to also work as a "edit target" window.

[pobiega]

Edit functionality not yet added, but should be trivial with new filterSettingsDialog implementation.