Add drop date to Amonkhet
Add drop date to Amonkhet

Now that blocks drop in pairs, this looked asymmetrical with the first
two blocks being consistent with each other in having a labeled drop
date and the last two being inconsistent.

I think I want to change the design around a little bit to only have one
label per pair of blocks, but not sure what that would look like yet.

glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard,glacials/whatsinstandard