Auto Save, School kids, crafting and spelling

The new update fixes the following bugs: - Auto Save no longer overwrites the last used slot, but always the 19th slot - Schoolchildren in chapter 4 no longer run away if you talk to them twice - the crafting of healing and mana potions no longer costs gold - Space Invader no longer crashes - the tower in the northeast of heaven no longer hides the player's head - 30 orthographic mistakes in favour of better reading flow were eliminated