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.

include/config.h

@@ -173,9 +173,9 @@
 /*
  * Section 2:   Some global parameters and filenames.
  *
- *              LOGFILE, XLOGFILE, NEWS and PANICLOG refer to files in
- *              the playground directory.  Commenting out LOGFILE, XLOGFILE,
- *              NEWS or PANICLOG removes that feature from the game.
+ *              LOGFILE, XLOGFILE, LIVELOGFILE, NEWS and PANICLOG refer to
+ *              files in the playground directory.  Commenting out LOGFILE,
+ *              XLOGFILE, NEWS or PANICLOG removes that feature from the game.
  *
  *              Building with debugging features enabled is now unconditional;
  *              the old WIZARD setting for that has been eliminated.
@@ -598,6 +598,21 @@ typedef unsigned char uchar;
    whole thing, then type a new end for the text. */
 /* #define EDIT_GETLIN */
 
+#ifndef NO_CHRONICLE
+/* CHRONICLE - enable #chronicle command, a log of major game events.
+   The logged messages will also appear in DUMPLOG. */
+#define CHRONICLE
+#ifdef CHRONICLE
+/* LIVELOG - log CHRONICLE events into LIVELOGFILE as they happen. */
+/* #define LIVELOG */
+#ifdef LIVELOG
+#define LIVELOGFILE "livelog" /* in-game events recorded, live */
+#endif /* LIVELOG */
+#endif /* CHRONICLE */
+#else
+#undef LIVELOG
+#endif /* NO_CHRONICLE */
+
 /* #define DUMPLOG */  /* End-of-game dump logs */
 #ifdef DUMPLOG