Variable track length feature in Map

[vj2181]

For the map display it is useful to have many different modes of displaying the tracks.

i) Display only the position at current time step (how things are at present in ROS2)
ii) Display the last n seconds of the track (useful for really long / repetitive tracks). Ofcourse this can be extended to show n seconds from the future as well in the case of bag files.
iii) Preload and display the entire track (Already exists for ROS1 bags, need this for ROS2 bags)

Another key need in the case of multi platforms or multiple navigation sources is the ability to select which among the many navsatfix messages to plot. This I beleive has alread been requested in issue 1615.

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