* move music path enumerations into d2resource
* move text dictionary (.tbl) loader into d2fileformats sub-package d2tbl
* lint fix, add doc file for d2tbl
* moved data_dictionary.go into d2fileformats sub-package d2txt, added doc file
* added sub-packages d2geom for geometry-related things, and d2path for path-related things
* moved calcstring.go to d2calculation
* move bitmuncher, bitstream, stream reader/writer from d2common into sub-package d2datautils
* fix lint errors in d2datadict loaders (caused by moving stuf around in d2common)
* move size.go into d2geom
* move d2common/cache.go into sub-package d2common/d2cache
* renamed d2debugutil to d2util, moved utility functions from d2common into d2util
* 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
* add interface for stats, d2 is an implementation
* fix incorrect comment, remove ennecessary int
* simplified description functions, remove duplicates
* moved default stringer functions
* fixed incorrect stat combine method
* change `Create` to `New` in method names
* d2stats + diablo2stats refactored again
- simplified `NewStat` provider function
- added initializer for stat values that sets the stringer functions, value types, and combination types for values when created
- removed redundant description functions
- added stat value combination types `sum` and `static`
`static` stat values which are not altered when stats are combined. this makes sense for stats like proc-on-hit or +skills to class
example:
Stat A: `10% reanimate as: skeleton mage`
Stat B: `8% reanimate as: skeleton archer`
Stat C: `6% reanimate as: skeleton archer`
A and B can not be combined
B and C can be combined to `14% reanimate as: skeleton archer`
