Sal1800's Agriculture Sat Nav and Light Bar with KML jobs

This add-on updates Sal1800's Agriculture Sat Nav and Light Bar by adding support for user-created KML field jobs. Users can define agricultural fields and working lines in Google Earth, export them as KML files, and load them into the Sat Nav for use during flight. The system supports multiple fields and job files, displays Google Earth pins as waypoints, and provides automatic calculations for area and passes. Existing manual guidance features are retained alongside KML-based guidance.