fix(data): correctly parse special cost

feat(data): add skill cost, item vnum, dash, upgrade

fix(data): read UsesSecondaryWeapon correctly

feat(data): add skill attack type, uses secondary weapon and element

fix(nosfiles): correct MpCost position in nosfiles

Merge pull request #22 from Rutherther/data

Add NosTale data information

feat(data): add .nos files parsing support