Add sleep logic in playback.

This also removes the "." between the seconds and nanos so that we don't mistake it
for a float, which it isn't.

capture.c

@@ -62,7 +62,7 @@ int dump_event(struct timespec* start, int fd, char* type) {
 		return 1;
 	}
 
-	printf("%ld.%ld,%s,%s\n",
+	printf("%ld %ld,%s,%s\n",
 		diff.tv_sec,
 		diff.tv_nsec,
 		type,