Add 25 type monsters, more than 200 new sprites

• 16-Medusa
• 17-Harpy
• 18-Golem
• 19-Elemental
• 20-Phoenix
• 21-Behemoth
• 22-Minotaur
• 23-Succubus
• 24-Imp
• 25-Naga
• 26-Dullahan
• 27-Centaur
• 28-Gigas
• 29-Will-o-wisp
• 30-Cthulhu
• 31-Demon
• 32-Ghast
• 33-Shade
• 34-Cyclops
• 35-Djinn
• 36-Dryad
• 37-Basilisk
• 38-Ettin
• 39-Gargoyle
• 40-Mandrake