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/global.h

@@ -463,4 +463,21 @@ extern struct nomakedefs_s nomakedefs;
 #define unctrl(c) ((c) <= C('z') ? (0x60 | (c)) : (c))
 #define unmeta(c) (0x7f & (c))
 
+/* Game log message type flags */
+#define LL_NONE       0x0000 /* No message is livelogged */
+#define LL_WISH       0x0001 /* Report stuff people type at the wish prompt */
+#define LL_ACHIEVE    0x0002 /* Achievements bitfield + invocation, planes */
+#define LL_UMONST     0x0004 /* Kill, Bribe or otherwise dispatch unique monsters */
+#define LL_DIVINEGIFT 0x0008 /* Sacrifice gifts, crowning */
+#define LL_LIFESAVE   0x0010 /* Use up amulet of lifesaving */
+#define LL_CONDUCT    0x0020 /* Break conduct - not reported early-game */
+#define LL_ARTIFACT   0x0040 /* Excalibur, Sting, Orcrist, plus sac gifts and artwishes */
+#define LL_GENOCIDE   0x0080 /* Logging of genocides */
+#define LL_KILLEDPET  0x0100 /* Killed a tame monster */
+#define LL_ALIGNMENT  0x0200 /* changed alignment temporarily or permanently */
+#define LL_DUMP_ASC   0x0400 /* Log URL for dumplog if ascended */
+#define LL_DUMP_ALL   0x0800 /* Log dumplog url for all games */
+#define LL_MINORAC    0x1000 /* Log 'minor' achievements - can be spammy */
+#define LL_DEBUG      0x8000 /* For debugging messages and other spam */
+
 #endif /* GLOBAL_H */