[#1620, #1626, #1689] Add spell config & type restriction to ItemGrant advancement

[arbron]

• Add ability to override spellcasting ability, preparation mode, and max uses for spells added using item grant advancement (resolves Add spell configuration to ItemGrant advancement #1626)
• Prevent class, subclass, or background items from being added using item grant to avoid issues caused by the use of the advancement system in a way that isn't yet supported (existing advancements that do this won't break, but new ones can't be created through the interface) (resolves Prevent ItemGrantAdvancement from adding classes, subclasses, or backgrounds #1689)
• Localize delete title that was missed (resolves Title text for delete item icon on Item Grant Advancement config isn't localized #1620)
• Move drag & drop code into AdvancementConfig to prepare for sharing with ItemChoiceAdvancement