Update pet item ignore list

[leevccc]

i add code about pet item ignore list

but I am not familiar with r/w to database, could you help me with this part?

[iw2d]

I changed several things in addition to adding the Database handling, also noticed some issues with pet initialization while testing, so I fixed that too while I was at it.

Some notes:

• The PetUpdateExceptionListRequest packet will always send the entire list, with your original implementation, it would have been impossible to remove items from the exception list.
• Contrary to what the in-game notification says for the item ignore following that of the boss pet (pet index 0), the client does seem to go through each of the pets' exception lists. But to avoid confusion, I chose to make it so that only 1 exception list is shared across all pets.

Comments on code style:

• I believe putting the exception list in the ConfigManager class was more fitting, rather than in CharacterData
• I like to declare variables as final wherever possible - it's good to be explicit about which variables can or cannot change, and helps with readability
• I prefer to avoid using static imports except in the rare cases where it actually helps with the readability