Implement PKZIP OpenCL format

[amheydari]

No description provided.

[kholia]

Probably not going to happen. See Solar's email to john-users (or was it john-dev).

[magnumripper]

http://www.openwall.com/lists/john-users/2014/08/02/2

This format is not very GPU friendly (different amount of work for different plaintexts) and before even trying to implement it we'd need to get mask mode in place.

[solardiz]

before even trying to implement it we'd need to get mask mode in place.

We have on-device mask mode support by now, so can approach implementing this format now.