[Request] Support for KangarooTwelve (Aeon v8)
(Cross-posted at https://github.com/xmrig/xmrig-amd/issues/250)

Aeon is planning to change its PoW to KangarooTwelve (https://github.com/aeonix/aeon/pull/108) in the next v8 hard fork. I've already made a patch for the CPU version (https://github.com/xmrig/xmrig/pull/1004) by simply copying the reference code, but my expertise in GPU coding is quite limited, so it'd be very much appreciated if you could provide a good GPU implementation. You're welcome to create a funding proposal at https://www.aeonfunding.com/proposals if you want.

A testnet pool: http://162.210.173.150:8080
