More detailed debug logs

[grinapo]

Would be nice to have more detailed logs of:

• updated internal tables (routing, peers, ....)
• packet routing decisions and related happenings
• dropped / blackholed / lost packets, targets

The main reason is that when something is unreachable (especially for the new users), be that normal Ygg addresses or more probably CKR (Crypto Key Routing) connections, there is no signs about what happens, where the packet went and never came back again.

As @Arceliar mentioned:

just try to keep logs out of the hot path when things are successful, since there's a non-zero cost even when logging is disabled.

[Saiv46]

@neilalexander It's 0.5 already (lol)

It needs a separate milestone of uncertain amount of time