* adding debug printing boxes for entity bounds
* minor edits
- adding `spawnmon` command. currently does not have a netpacket, just for debug
- adding `GetSize` method to map entities for getting frame bounds (for debug printing)
* bug fix
* added highlight to animated entity
* moving provider functions for item, missile, npc, player into package export file d2mapentity.go
* changed `Create` to `New` in map entity provider functions
* add item highlight on hover
* add Name method to item entity
* wip d2items system and item properties
* added loader for TreasureClassEx.txt
* wip item spawn from treasure class records
* wip items
* add call to init item equivalencies, remove treasure class test from d2app
* made item affix records global var a map of affix codes to the records
* changed how item to item common record equivalency is determined
* changed set items records export to a map of their codes to the records, grouped property params into a struct
* changed property parameter field from calcstring to string
* fixed bug in stat value clone
* adding equipper interface as part of stat context, eventually to be used to resolve set bonus (among other things)
* made the item interface simpler, only needs name and description methods
* adding equipper interface, for anything that will equip or have active items
* handle case where min and max are swapped, removed commented code
* added property/stat resolution for magic, rare, set, and unique items
* adding item generator which can roll for items using treasure class records
* fixed item equivalency func being called in the wrong spot
* added item spawning
- added packet type for spawning items
- added client/server handlers for SpawnItem packets
- added map entity for items
- added simpler item provider function in diablo2item package
- added debug terminal command for spawning items
