New dungeons, bosses, items, collectibles

Added two level dungeon: Frigri Wine Cellar
Added one level dungeon: Vampire Lair
Made changes to world map near Vampire Lair region and Leviathan
Mountain area to accommodate new dungeons.
Added one level dungeon: Giant's Tower
Added new collectibles
Added two new bosses and two boss items
Added sturdy trait to several older bosses
Merge pull request #578 from sedgwick/map-changes

New dungeons, bosses, items, collectibles