preFix refer to nonexist 13's riddle
- not 12's floor , riddle update
Enter 13Floor
-add 13floor state
-specialize state changing "12to13"
--add full door-open function
--bg change
-add alternative text for Entering 13floor
Collider ON
-add collider2d to 13floor object
-enable only 13floor

+fix+
open full door speed 0.8f
add truechoiceflag to 13floor
fix conflict