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/hack.c

@@ -569,7 +569,17 @@ still_chewing(xchar x, xchar y)
     }
 
     /* Okay, you've chewed through something */
-    u.uconduct.food++;
+    if (!u.uconduct.food++)
+        livelog_printf(LL_CONDUCT, "ate for the first time, by chewing through %s",
+                       boulder
+                       ? "a boulder"
+                       : IS_TREE(lev->typ)
+                       ? "a tree"
+                       : IS_ROCK(lev->typ)
+                       ? "rock"
+                       : (lev->typ == IRONBARS)
+                       ? "iron bars"
+                       : "a door");
     u.uhunger += rnd(20);
 
     if (boulder) {
@@ -2071,7 +2081,8 @@ domove_core(void)
                        killed() so we duplicate some of the latter here */
                     int tmp, mndx;
 
-                    u.uconduct.killer++;
+                    if (!u.uconduct.killer++)
+                        livelog_printf(LL_CONDUCT, "killed for the first time");
                     mndx = monsndx(mtmp->data);
                     tmp = experience(mtmp, (int) g.mvitals[mndx].died);
                     more_experienced(tmp, 0);