OneZeroMiner 1.3.3

Changelog
Xelis:
    Add support for Stratum protocol (Vipor proposal)
    Add --xelis-solo option. Default is Stratum pool mining unless this flag is set or the server port is 8080

Note:
At the moment, only k1 and vipor(preproduction) pools are compatible with this version.
The protocol documentation is available on:
https://github.com/vipor-net/xelis-stratum-protocol