New sprintf which is 7 times faster then the libc one

(released under GPL)

Implementation of sprintf_irc, tuned for IRC sprintf use. Should be more then 5 times faster. 
Format                       sprintf         sprintf_irc     Speed up factor

 "12345678901234567890"      3.385 us        0.859 us        3.94
 "%s", buffer (20 chars)     3.780 us        0.547 us        6.91
 "%c%c%c", c1, c2, c3        3.640 us        0.376 us        9.68
 "%lu", (time_t)t            5.851 us        0.842 us        6.95
Less important: 
 "%d", 31337                 4.487 us        0.852 us        5.27
 "%u.%u.%u.%u",              9.069 us        2.431 us        3.73
Questions and comments about this page should go to the maintainer: Carlo Wood (Run @ IRC).