Add map and boss to birthday event

[Ummmmm]

Considering STS has added so many new events/event changes, it would be good to have an actual map and boss in addition to the cakes this year

[flashio]

-1 to the map.
+1 to the boss, could be like blotto event but instead of making him show up on houses make him show up on guildhalls to avoid exploits, would be cool if a random boss from ANY map would show up and depending on the boss it will drop currency related to its expansion (for Brackenridge - Dead City the currency could be story tokens).