Chronicle of major events, and livelog

Log game events, such as entering a new dungeon level, breaking
a conduct, or killing a unique monster, in a new "Major events"
chronicle. The entries record the turn when the event happened.
The log can be viewed with #chronicle -command, and the entries
also show up in the end-of-game dump, if that is available.

This feature is on by default, but can be disabled by
defining NO_CHRONICLE compile-time option.

This also contains "live logging", writing the events as they
happen into a single livelog-file. This is mostly useful for
public servers. The livelog is off by default, and must be
compiled in with LIVELOG, and then turned on in sysconf.

Mostly this a version of livelogging from the Hardfought server,
with some changes.

src/shk.c

@@ -513,6 +513,10 @@ rob_shop(struct monst* shkp)
     /* by this point, we know an actual robbery has taken place */
     eshkp->robbed += total;
     You("stole %ld %s worth of merchandise.", total, currency(total));
+    livelog_printf(LL_ACHIEVE, "stole %ld %s worth of merchandise from %s %s",
+                   total, currency(total), s_suffix(shkname(shkp)),
+                   shtypes[eshkp->shoptype - SHOPBASE].name);
+
     if (!Role_if(PM_ROGUE)) /* stealing is unlawful */
         adjalign(-sgn(u.ualign.type));