Moat: add support for obfsproxy's meek_lite

We should improve the Moat client support in Tor Launcher so it will work with obfsproxy's meek_lite implementation (as well as with dcf's meek implementation). The main reason it does not currently work is because the code inside Tor Launcher that interacts with the PT program relies on command line parameters instead of SOCKS args to pass info to the PT.

For more background, see ticket:29430#comment:5 and other related comments within #29430 (moved).

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