*`StreamReader.Read` methods now return errors
The other edits in this commit are related to cleaning up lint errors
caused by the changes to StreamReader
* suppressing the magic number lint errors in mapgen, it will get a heavy refactor soon, hopefully...
* adding string token constants for SkillClass
* adding panic on error to left/right skill select render
* fixed cuddle lint error
* fixed unnecessary conversion, unused func param lint errors in dcc_animation.go
* adding comment for skill class tokens
* fixed typo in comment
* removed unused parameter in dcc/dc6 animations
* supress warning about Object.setMode always being passed direction value of 0
* fixed all invalid golint directives
* fixed a couple gocritic lint errors
* 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
* camera offset for ui panels :
added maprenderer viewport to be aligned left or right
calling alignement on keyPress in game_controls
* check if already aligned
* fix bugs
-forgot to assign alignement
-defaultScreenRect instead of screenRect because of issue mentionned in original comment
* remove config.json and replace go.mod line
* removing duplicate import of d2common
replacing all dh to d2common
* remove useless breaks from switch statement
* better range when value unused + prettying import
* item_affix rewrite
using return values instead of pointer references in arguments
* ebiten deprecated calls
* small fixes
