Revert "Bug #991: Don't autoequip items with harmful permanent enchantments"

This is no longer needed, since merchants no longer equip items sold to them (2f35e5a04ef828d4e99e28e0be74b175c766d13d). Also, items with harmful enchantments that are initially in the NPCs inventory *must* be equipped (e.g. slave bracers)

This reverts commit 71d9755ef167a25ea3ce8098325b44e0811b6bf8.
Move levelled list code out of ContainerStore