Add GhostRider Support

[Raptor3um]

Please add GhostRider algorithm support (from Raptoreum).
https://github.com/npq7721/gr_hash

Miner support is growing quickly and it is currently the most profitable CPU coin. GPU miner is not too far off as far as I know.

I made this again here in discussions as I received an email that issues were now to be posted in discussions.

[calvintam236]

duplicate of #852