Add dedicated events log file support

I've created some code that allows events in SimpleServer to write to a separate log file.

Events can use the commands "log" and "logprint". The command "log" will output log text only to the file, and "logprint" will output data to the file and console simultaneously.

Example:
```xml
<event name="TestEvent">
log "Test log command"
logprint "Test logprint command"
</event>
```

Output:

File created: events_20130528-221831.txt
```
2013-05-28 22:18:34	TestEvent @L1	Test log command
2013-05-28 22:18:34	TestEvent @L2	Test logprint command
```

Console:
```
L2@TestEvent msg: Test logprint command
```