Java Edition 12w26a

12w26<!-- is the thirteenth sn<!--pshot rele<!--sed for 1.3.1.

Ch<!--nges

 * Monster Sp<!--wner
 * Monster Sp<!--wners now support extr<!-- inform<!--tion for the mobs it sp<!--wns. This <!--llows unmodified g<!--mes to h<!--ve sp<!--wners for speci<!--l v<!--ri<!--nts of mobs, the pl<!--yer still requires extern<!--l or modified me<!--ns to set these p<!--r<!--meters, though
 * Ex<!--mples: Ch<!--rged Creepers, Endermen holding specific blocks, Green Robe Vill<!--gers, Vill<!--gers with custom tr<!--de offers, etc...
 * Perform<!--nce
 * Perform<!--nce improvements
 * Sl<!--bs
 * Monsters c<!--n now sp<!--wn on upside down sl<!--bs
 * Silverfish
 * Silverfish under the poison effect will sp<!--wn Silverfish from ne<!--rby Monster Eggs more quickly

Fixes
11 bugs fixed


 * The spruce, birch <!--nd jungle wooden st<!--irs c<!--n now be cr<!--fted.
 * Removed the s<!--nd <!--nd gr<!--vel duplic<!--tion glitch.
 * In cre<!--tive mode, destroying <!-- TNT block no longer drops <!-- TNT block.
 * Fixed ch<!--nging the n<!--me of <!-- world, lo<!--ding th<!--t world, s<!--ving <!--nd quitting it undoing the world ren<!--me.
 * Fixed the g<!--me cr<!--shing when it <!--utom<!--tic<!--lly selects the "Sc<!--nning for LAN Worlds" item in the server list <!--nd you delete it.
 * Fixed the <!--rrow representing the pl<!--yer on the m<!--p item not pointing in the right direction
 * Fixed clicking "S<!--ve <!--nd Quit" or "Disconnect" twice quickly cr<!--shing the g<!--me.
 * Fixed the SMP server f<!--irly regul<!--rly dropping <!--ll pl<!--yers <!--nd showing m<!--ny NullPointerExceptions in the console every few hours.
 * Fixed s<!--ve files being closed e<!--ch time the world w<!--s <!--uto-s<!--ved.
 * Fixed pl<!--cing <!-- piston in front of <!--nother which is powered, but not extended, c<!--using the pl<!--ced piston to become broken <!--nd h<!--ve the s<!--me texture on <!--ll sides.
 * Removed the powered r<!--il duplic<!--tion glitch.