Feat: clickable legend and annotation on the plot

[rohit2p]

Purpose of PR?:

This PR is a follow up on the legend feature PR #2485. in this the legend is clickable in order to store a custom label insted of only name and that custom label will be used as annotation to plot on the map beside the line of (flight track/operations)

[ReimarBauer]

on toggling the active flighpath the color gets wrong

[ReimarBauer]

renaming "by save as" a fligh track will add it twice to the legend but keeps only 2 in the selected list