Add Kid Book

Adding Kid Book icon and entry in items.xml. Also adding a new fake race, the Troll.
Race number can NOT be above 0 or below -100. manaplus searches for the sprite this way: (-100 - class). Any number above 0 is an item; any number below -100 is an npc and any number below -1000 is a monster.

For the player to be able to see the race the number must be between -100 and -199.
But if you make the race change using an item instead of a "permanent" class change (with set Class;) you can use any id but it will be bound to the item (any equip slot) and not to the character (slot 0).

TL;DR this *should* work but to avoid confusion I would rather put the 11054_Troll.xml into a "mods" or "swap" subfolder (items/racesprite/mods/item-11054_Troll.xml) since it does not really change your race