Remove broken_gravestone from unknown licensing list.
Add information on origins of big_demon and imp images.
Move clearing of FLAG_NO_SKILL_IDENT back to identify()
Fix missing endlore in flying ant bestiary info.
Add bestiary descriptions for flying ants and mice.
Add elevation around Samorok's keep.
Add dryness definitions for permanent lava and blackrock.
Recolor blackrock to be visually fitting, while keeping rtro aesthetic.