Prologue fixes and improvements

[h2][b]Prologue fixes and improvements v0.18[/b][/h2] [img]{STEAM_CLAN_IMAGE}/43034943/4d6695f8f6848c3f9c2ab22b9bedc75740391156.png[/img] [h3][list] [*] 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 [/list][/h3]