SCANsat

 - Fix memory leak related to visual maps

- Add scanning coverage indicators to big map

- Add function to allow the zoom map to remember the last used zoom level

- Update French translations (don-vip)

- Reduced memory usage by visual maps
- Fixed several errors related to visual maps when using Kopernicus

- Allow vessels with old scanner parts to be loaded in VAB/SPH
- Fix error when PluginData folder for settings file has been deleted
- Clarified surface-in-daylight requirement for certain scanners
- Updated KSPedia entry to reflect newer features of big map, zoom map, and Breaking Ground surface feature detection