Major changes around events, event log, etc.

* 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

core/config.js

@@ -147,7 +147,7 @@ function getDefaultConfig() {
         users : {
             usernameMin         : 2,
             usernameMax         : 16,   //  Note that FidoNet wants 36 max
-            usernamePattern     : '^[A-Za-z0-9~!@#$%^&*()\\-\\_+ ]+$',
+            usernamePattern     : '^[A-Za-z0-9~!@#$%^&*()\\-\\_+ .]+$',
 
             passwordMin         : 6,
             passwordMax         : 128,