Battle in the Burial Mounds (+ Chickens!)

Investigate the suspicious trees on the world map to fight against new spookier* enemies in the Burial Mounds. This "expansion" area comes with new mechanics for enemy accuracy and status effects like poison** that I vaguely hope to extend more in the future. 

(* Not that spooky, they're still made of like ten pixels.)
(** Possibly the only context in which being poisoned is an enhancement.)

Chicken Chase - New Minigame

Help Lan Wangji collect chickens.  This is very important, for reasons he will not remember when he is sober again.  Talk to Lan Jingyi/Wen Ning to play.

Victory Boost

Get a 10% bonus to XP earned for every subsequent battle won when you Continue Fighting. Keep that winning streak and level up faster.  

You'll now be shown how much XP you earned after you win each battle.

There's a new info box feature to show your current level and XP needed to level up, accessible on the overworld map with the ⓘ icon or the letter i on your keyboard. Thought that might be handy to have available since some features are locked to higher levels.

All the small things...

A few backgrounds got updates/maybe improvements that were long overdue.

Rewrote a bunch of things, as always when I get into this code.  This batch includes quest flag storage, so you can do the Caiyi vendor's quest again even if you've done it before.