- API expand

- Add Sender
- Add Skin

* Note *
This update contains some experimental features. (like Sender)

Book:
class: sender
type: item
dialog: Book_Dialog
name: Book #talker name
consume: true #whether item is consumed when dialog is ended completely.
inventory:
name: The page of Book #inventory name
item:
type: book
display: Book
lore:
- some funny book.

Book_Dialog:
class: dialog
talk:
- hello world!

You can now use Sender that enable to execute dialog without NPC.
Sender item can get by this command: /qa s g <player> <item name>

Please feel free to send DM to me if you have a any question.
My discord name is toxicity188.