Cleanup all antena-marker svg elements on reset

Fixes hanging on server disconnect.
Comments + Cleanup
Use only max-range-background for max range

Also using max-range made it possible to hide the colored background while still showing the max range with a black circle, but this is not necessary as the multitude of black circles is too messy.
Use separate plane for displaying stronges antenna range per tag
Add selection buttons for showing/hiding strongest ranges