Attempting to use gpars for multithreading, Agents currently modifying
scene graph after update loop has completed -- results in an exception.
--Temporary fix for keeping chainable
Merge branch 'gpars_multithreading' of https://github.com/frugs/dungeon-crawler into gpars_multithreading

Conflicts:
	build.gradle
	src/main/groovy/com/frugs/dungeoncrawler/event/Interruptible.groovy
	src/main/groovy/com/frugs/dungeoncrawler/event/player/PlayerMove.groovy
	src/test/groovy/com/frugs/dungeoncrawler/event/EventManagerTest.groovy
-- vaguely working again after some refactoring
-- Use ForkJoin for forking event runners
-- Trying GParsStm for thread safety, untested
-- Oops. Event manager add queue is now marked as synchronised