New journal event "output"

Redundant information, but incredibly useful when you want to figure
out what happened without a (still nonexistent) journal replay tool.
The redundancy could help making a journal replay tool more robust.

To enable, set econfig key keep_journal to at least 2.  Output events
are *not* flushed to disk immediately.

include/econfig-spec.h

@@ -89,6 +89,9 @@ EMPCFBOTH("port", loginport, char *, NSC_STRING, KM_INTERNAL,
     "TCP port the server will bind")
 EMPCFBOTH("keep_journal", keep_journal, int, NSC_INT, KM_INTERNAL,
     "Enable journal log file")
+EMPCF_COMMENT("# 0 - Disabled\n"
+    "# 1 - Enabled, player output suppressed\n"
+    "# 2 - Enabled, log everything (big; rotating & compressing advised)\n")
 EMPCFBOTH("post_crash_dump_hook", post_crash_dump_hook, char *, NSC_STRING, KM_INTERNAL,
     "Shell command run right after a crash dump, in the game's data directory")
 EMPCFBOTH("privname", privname, char *, NSC_STRING, 0,

include/journal.h

@@ -33,12 +33,15 @@
 #ifndef JOURNAL_H
 #define JOURNAL_H
 
+#include "types.h"
+
 int journal_startup(void);
 void journal_shutdown(void);
 int journal_reopen(void);
 void journal_login(void);
 void journal_logout(void);
 void journal_prng(unsigned);
+void journal_output(struct player *, int, char *);
 void journal_input(char *);
 void journal_command(char *);
 void journal_update(int);

include/types.h

@@ -48,6 +48,7 @@ struct nchrstr;
 struct nstr_item;
 struct nstr_sect;
 struct nukstr;
+struct player;
 struct plist;
 struct plnstr;
 struct range;