[Adventure Mode 0.3.1]

* Changes
+ Close events are now shown in single player
+ Boss events including adds
+ Plug & play event system for custom events!
e Integration of invasions into new event system
f monsters now spawn with gear!
f monsters won't spawn in bright areas anymore (lightlevel > 10)
c monsters cannot spawn in normal rain (on the surface)

* Known issues
f pigmen won't attack a player
f spiders and skeletons may not attack a player when spawned too far