Remove UNKNOWN.hpp
Remove UNKNOWN.hpp

I think this is just an old version of engine.hpp. Drop it.

camponez/bitshares,FollowMyVote/bitshares,jakeporter/Bitshares,bitshares/bitshares,bitsuperlab/cpp-play,frrp/bitshares,bitshares/bitshares,Ziftr/bitshares,RemitaBit/Remitabit,bitsuperlab/cpp-play,Ziftr/bitshares,bitshares/bitshares-0.x,bitshares/bitshares-0.x,dacsunlimited/dac_play,bitshares/bitshares-0.x,bitsuperlab/cpp-play,bitshares/devshares,bitshares/bitshares-0.x,camponez/bitshares,frrp/bitshares,bitsuperlab/cpp-play,camponez/bitshares,camponez/bitshares,dacsunlimited/dac_play,Ziftr/bitshares,bitsuperlab/cpp-play,bitshares/devshares,bitshares/devshares,camponez/bitshares,frrp/bitshares,frrp/bitshares,frrp/bitshares,bitshares/bitshares,RemitaBit/Remitabit,bitshares/bitshares,dacsunlimited/dac_play,bitshares/devshares,FollowMyVote/bitshares,Ziftr/bitshares,dacsunlimited/dac_play,bitshares/bitshares-0.x,RemitaBit/Remitabit,jakeporter/Bitshares,bitshares/bitshares,FollowMyVote/bitshares,bitshares/devshares,jakeporter/Bitshares,jakeporter/Bitshares,frrp/bitshares,FollowMyVote/bitshares,jakeporter/Bitshares,RemitaBit/Remitabit,RemitaBit/Remitabit,bitsuperlab/cpp-play,bitshares/bitshares-0.x,bitshares/devshares,dacsunlimited/dac_play,FollowMyVote/bitshares,jakeporter/Bitshares,FollowMyVote/bitshares,RemitaBit/Remitabit,camponez/bitshares,bitshares/bitshares,dacsunlimited/dac_play