Monsters and items Progression

Merge branch 'draw_stairs'

corrected bug at message_box call in main menu

confusion scroll/targeting-fireball scrool/dropping items, lesson 9

items/inventory/use items, lesson 8

mouse support: look command, lesson 7

sowrd-fighting/deaths, lesson 6

populating dungeon/game states/fighting orderly, lesson 5

exploration (fog of war), lesson 4

dungeon generator, lesson 3