Add Actually Legitimate URL Shortener Tool

[ameshkov]

https://raw.githubusercontent.com/DandelionSprout/adfilt/master/LegitimateURLShortener.txt

Category: privacy
Tags: privacy
Description: see #400 (comment)

[DandelionSprout]

Near-identical to the in-list ! Description: value:

"In a world dominated by bit.ly, ad.fly, and several thousand other malware cover-up tools, this list reduces the length of URLs in a much more legitimate and transparent manner. Essentially, it automatically removes unnecessary $/& values from the URLs, making them easier to copy from the URL bar and pasting elsewhere as links."

[ameshkov]

There's one thing that bothers me: $removeparam is not supported by the browser extension (it'll be soon, but not yet) and by Safari/iOS (never will be).

We should be able to control this on the server-side and choose for which platforms the lists are compiled.

A task for https://github.com/AdguardTeam/FiltersCompiler