Ergodox Workman Layouts - Generic and Mac-Specialized

Hello,

I've added two Workman layouts. The first is based on your Cub-layout, but adjusted to be Workman-specific.

The second one, `workman_kinesis_mac` is tweaked to be more faithful to the Kinesis layout and also designed to favor Macs. It uses layer one for mouse, media, and f-keys, but all other layers are inaccessible (for now).

Let me know what you think.