Remove deprecated properties multiFeatureIndex, index, location and dist from nearest-point-on-line

[EmilJunker]

This PR is a follow-up to #2867 and removes the deprecated properties multiFeatureIndex, index, location and dist from the points returned by the nearestPointOnLine function.

As previously agreed, the properties are being removed in favor of the new ones with clearer names:

• multiFeatureIndex -> lineStringIndex
• index -> segmentIndex
• location -> totalDistance
• dist -> pointDistance

This is, of course, a breaking change. Therefore, this PR should only be merged when the next major release is due.

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