* User stat set vs user stat increment system events
* Proper addMultipleEventListener() and removeMultipleEventListener() Events APIs
* userStatSet vs userStatInc user stat achievement types. userStatInc for example can be used for door minutes used
* User event log is now functional & attached to various events
* Add additional missing system events
* Completely re-write last_callers to have new functionality, etc.
* Events.addListenerMultipleEvents()
* New 'moduleInitialize' export for module init vs Event specific registerEvents
* Add docs on last_callers mod
Bryan Ashby