Fixes item not being returned when salvage fails
Removes some redundancy when giving back items
Makes extended salvage return 50% of the salvage (no items if only one item would be returned)
Adds a better message when failing to salvage extended salvage items
Fixes a bug in the caching of smith presets
Implements ignored salvage
Implements salvage-able items
Adds some TODOs
Implements salvage fail chance
Moves several methods to ItemHelper
Adds option for allowing extended salvage
Adds the classes necessary for the new scrapper
Partly implements some scrapper functionality
Restructures some classes to reduce code duplication
Moves some classes to make some classes easier to find
Adds a bunch of TODOs where things have an unfinished implementation
