fix click/hover on lines: use minDistance and optimize functions

[trafficonese]

Somehow with all the newly merged PR's the click/hover function for Lines returns worse results.
That is because currently only the last found feature is returned.

I changed that and included a new variable minDistance, so that the feature with the smallest distance will be returned.

Some optimizations for tryClick and tryHover for Lines:

• moved the checkClick, checkHover functions outside the loops.
• new chosenWeightFn outside the second for-loop, to not repeatedly check the data type.
• used Set instead of Array for oldHoveredFeatures and newHoveredFeatures

[trafficonese]

@robertleeplummerjr Could you maybe look into this?