Features Required to fit 2.2.0

[Litorom]

List of features that are required be implemented to match the theme of the update:

• [x] Storyline rewrite
• [x] New second boss to replace the removed one (#376)
• [x] Quests (#203)
• [x] Story elements to which the devs are fit:
• [x] Fences
• [x] Signs
• [x] Add a new structure to caves layers (likely delayed to 2.2.1+ or 2.3)
• [x] New Achievements
• [x] Audio Fixes

Suggested Features from the discord:

• [x] Add OBK lore book (not necessary anymore)

[BenCheung0422]

#319 is moved to 3.0 update.