include/structs: Fill in CNWSAreaOfEffectObject.h
include/structs: Fill in CLassUpdateObject.h
include/structs: Update CNWSCreatureStats.h
include/structs: Fill in CNWSCreatureAppearanceInfo.h
include/structs: Update CNWSCreature.h
include/structs: Fill in CNWSCombatRound.h
include/structs: Add CServerInfo.h
include/structs: Update CServerExoAppInternal.h
include/structs: Add CFeatUseListEntry.h
include/structs: Add CSpawnPoint.h
include/structs: Add CNWSObjectActionNode.h
include/structs: Add CNWVisibilityNode.h
include/structs: Add CNWSPVPEntry.h and CNWSPVPEntryList.h
include/structs: Add CScriptTalent.h
include/structs: Move CResRef to top in all.h
include/structs: Reorder includes CNWSCreature.h and CNWSCreatureAppearanceInfo.h
include/structs: Add CNWSSpellScriptData.h
nxlib: Change CNWMessage__WriteCExoString parameter types.

Makes it simpler to work with from C this way.
nxlib: Add item property constants.
nxlib: Change CNWSCombatRound__GetAttack return type.