Automatic Worker Placement for "Special Workspaces"

[bhazzard]

Special Spaces don't really need to ask how many workers, since they have a set number of required workers:

• Field: 1
• Special Hut: 2
• Toolmaker's Hut: 1
• Buildings: 1
• Cards: 1

So we should just place the workers right away, perhaps with a confirmation. Later we can make turn confirmations configurable or something.

[mdellanoce]

done (who knows what terrible bugs I introduced, though)