feat(data): add equipment and item type

Merge pull request #32 from Rutherther/combat

Add combat extension

chore(data): add cast time and cooldown units to documentation

feat(data): make monster level ushort

Merge pull request #22 from Rutherther/data

Add NosTale data information

feat(data): add correct information into infos

feat(data): add skeleton for NosTale data