stbt: Add SamsungTCPRemote

SamsungTCPRemote controls certain Samsung Smart TVs according to the
protocol reverse engineered by Mike Szymaniak[1].  It works with my
Samsung UE32F5370.

[1]: http://sc0ty.pl/2012/02/samsung-tv-network-remote-control-protocol/
Merge pull request #106 from wmanley/samsung-remote

stbt: Add SamsungTCPRemote