MRA/KMLExporter: Cleanup variables.
MRA/KMLExporter: Account for no altitude measurements (-1).
MRA/KMLExporter: Fix a non relative path for MB legend.
MRA/KMLExporter: Rework path export to account for different src for the EstimatedState and also the track break for deltas > secondsGapInEstimatedStateForPathBreak (Neptus Property).
MRA/KMLExporter: Missed to comment out some code.
Merge branch 'feature/kml-multipath-export' into develop