- FIX: Synchronize fix data when creating new dynamic vessel
       (prevent ghost vessels never being cleaned-up)
- NEW: Identify currently selected objects on chart
- FIX: Display track even for small zoom factor
- NEW: Allow to specify selected objects color in 'settings.qvct'
- NEW: Save visibility status in QVCT files
- MOD: Reverted to "straight-forward" containers visibility toggling
- MOD: Newly added objects now inherit their parent's visibility status