Enhance debug mode/make debug mode less verbose

[zml2008]

This is prompted by the fact that debug mode logs player IPs to the console and to saved files, which may not be desired. At the moment debug mode gives a bit of a flood of information, which can be overwhelming as well.

Some tweaks to enhance debug mode are:

• Per-user debug mode
• Disable context logging (to limit exposure of player IPs)
• Send debug mode logging to somewhere else besides the main server log, in a more machine-readable format perhaps? A multi-document json file? Or a document database? This would allow further analysis of logged information.