Add method to view errors when parsing/generating items

[Niphyr]

Currently, when creating an item if it fails with an error like this:

System.ArgumentOutOfRangeException : ItemId not found: 179927 (Parameter 'ItemId')

There needs to be a way to propagate up to the return object some kind of error about generating this item so it can be displayed on the UI if needed or handled in the app.

This particular trinket while it exists in game, does not appear in the simc spelldata.

[Niphyr]

Test item string:

# Glowing Endmire Stinger (226)
# trinket1=,id=179927,bonus_id=6652/7215,drop_level=50