New timing infrastructure. There's a new function schedule_timer()

which pretty much any module can call to request a call-back in the
future. So terminal.c can do its own handling of blinking, visual
bells and deferred screen updates, without having to rely on
term_update() being called 50 times a second (fixes: pterm-timer);
and ssh.c and telnet.c both invoke a new module pinger.c which takes
care of sending keepalives, so they get sent uniformly in all front
ends (fixes: plink-keepalives, unix-keepalives).

[originally from svn r4906]
[this svn revision also touched putty-wishlist]

misc.h

@@ -3,6 +3,7 @@
 
 #include "puttymem.h"
 
+#include <stdio.h>		       /* for FILE * */
 #include <stdarg.h>		       /* for va_list */
 
 #ifndef FALSE
@@ -20,6 +21,8 @@ char *dupcat(const char *s1, ...);
 char *dupprintf(const char *fmt, ...);
 char *dupvprintf(const char *fmt, va_list ap);
 
+char *fgetline(FILE *fp);
+
 void base64_encode_atom(unsigned char *data, int n, char *out);
 
 struct bufchain_granule;