nyxrc config should also allow command line options

[saizai]

Namely:

• interface [address:]port
• socket path
• debug log path

It already has --log as logged_events.

[atagar]

Thanks Sai, this is a good idea. I'll implement this at some point if a patch doesn't roll in first.

When these are present in both the config and commandline the commandline should take precedence. On reflection our 'logged_events' is broken in this regard (the config overwrites any commandline arguments). We should fix that when making this change.