Spy (Forever)

- Class colours in battlegrounds: enemies detected in a battleground showed as black rows. There the game keeps a player's class hidden from addons, so Spy had none to colour with. Spy now hands the hidden class straight back to the game, which paints the row in the class colour without Spy ever reading it. The class icon and the class name in the row stay unknown in battlegrounds.
- `/spy debug` counts the players whose class the game keeps hidden.