New unique: Robin of the Strong Arm

A very early-game hobgoblin unique (currently at D2-4); about
twice as tough as a hobgoblin, but placing with a mob of goblin
& hobgoblin minions, and with the ability to buff them (with
Battlecry) and hurl them at the player.

As a nice piece of early-game loot, she has a guaranteed
helmet, like Crazy Yiuf's cloak. Implementation uses the Nikola
Hack (equipping it in her shield slot), alas.

(The code for goblin tossing is extremely bad and shameful.
I am sorry.)