A set of bug fixes for beta-branch, more to come

-Plague Doctor given a plague ability, for thematic reasons

-Agents told to go to a distant location by right clicking will assign themselves a "go to location" task

-Option to enable/disable events

-Added more events. Four major chains now exist: Twins, Letter, Tomb and Pyromaniac

-Bonus difficulty given to high-level rulers and dukes on harder difficulties

-Undead no longer attack Dark Empire

-Deep Ones are no longer hostile to surface-dwellers when not at war, reducing risk of getting killed by passing armies

-Your enthralled no longer sends letters to themself to turn themself insane

-Gods no longer exist between worlds, avoiding cooldowns being inherited from previous games

-Fixed Spread Fear so it's actually castable

-Fixed bug in events where they couldn't trigger on non-city locations