Add grade colorization on route profiles / elevation charts

[NikosK]

Grade viewing/previewing is an indispensable tool for planning and evaluating performance on a route. It would be really nice to have graphs colored by grade like in other services.

Here is an example:

In this chart it is easy to spot the climbs that would require most effort. Just the graph is not enough, because long routes with the width of the graph limited in a small area produce spikes that do not reflect an actual slopes one would have to cover.

[Jane]

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