Review a random sample of highways

[bkowshik]

Ref: #69 and #80

I prepared a random sample of highway features touched to manually 👀 for identifying good and harmful highways. We then use this knowledge to make the highway classifier better.

With @amishas157's help, I created a To-Fix task with 9,533 randomly selected highways. I used the Not an error button for good highways and Fixed button for harmful highway.

• To-Fix task: https://osmlab.github.io/to-fix/#/task/labellinghighwaysforgabbar

To start with I reviewed 100 highways and did not find any harmful.

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cc: @anandthakker @batpad @geohacker