Add various auto replay options:
 - All logs since the final client disconnected
 - All logs since the most recent client connect/disconnect
 - All logs since *you* last sent a message (already implemented)
 - All logs since X seconds ago (already implemented)
 - All logs since the current client last disconnected (track clients with some special token the client auto sends on connect)

Might need to #include <limits.h> in blabouncer.c to make some operating systems and/or compilers happy.

Handle re-connecting to the server failing.

Allow reloading the configuration file while running (at least for things like replayseconds, replaymode) - BLABOUNCER command and SIGHUP?