Rework inventory system

[FearMyShotz]

Important

This issue focuses on reworking the inventory system as well as implementing new features. It is used to track progress on the remaining tasks listed below.

Tasks related to the inventory system

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1. Implement new special inventories, like animated inventories, scrollable inventories or inventories that support storing items (and saving them)
2. Support all inventory types (crafting table, oven, anvil, brewing stand, merchant etc.)
3. Add methods to easily serialize inventory data, save it to a file (json, yml) or any storage provider (SaveableInventory)
4. Implement new special buttons, like animated buttons that define a BukkitRunnable
5. Support several animation types (NameAnimation, LoreAnimation, MaterialAnimation, EnchantmentAnimation, ItemFlagAnimation, DurabilityAnimation, SlotAnimation)