Add BurnsInDaylight to Lua API and Monsters.ini (#4295)

* Monster.h: Export SetBurnsInDaylight

This commit also adds BurnsInDaylight to check if the Monster burns in daylight
or not.

Closes https://github.com/cuberite/cuberite/issues/4294

* MonsterConfig.cpp: Add BurnsInDaylight

Closes https://github.com/cuberite/cuberite/issues/4294

src/Mobs/Skeleton.cpp

@@ -13,7 +13,6 @@ cSkeleton::cSkeleton(bool IsWither) :
 	super("Skeleton", mtSkeleton, "entity.skeleton.hurt", "entity.skeleton.death", 0.6, 1.8),
 	m_bIsWither(IsWither)
 {
-	SetBurnsInDaylight(true);
 }