Prologue fixes and improvements

Prologue fixes and improvements v0.18

Increased number of items in one stack to 32 Changed monsters AI not to attack the player through walls Now fuel won't decay when there are no items in furnace Notifications of picked up items Fixed a bug where monsters could spawn on floors, when the player was in underground at night Better UI scaling for different resolutions Fixed a bug where tooltips could cover items on some resolutions & UI scale combinations Fixed a bug where you could duplicate saddled alpacas Fixed a bug where you could place biomes in the underground Changed couple of objects that farmer goblin likes Other improvements