NPC traders

[GremlingThing]

About The Pull Request

The start of a component based NPC trader!

2 components, one to control the "NPC" (being the mob it's attached to) and the other one is the interaction UI

A helper spawner object landmark was added to help create interactable traders in the world editor and to spawn one in with little setup needed 👍

Todo things:

• Create a "ClickedOn" signal and allow blocking OnClick calls by the person who's clicked on.
• (Added onto ClickedOn) Using this method, allow people who can see the NPC trader & in range to be able to talk to them rather than being next to them.
• Make the trader UI work
• RnD interaction methods for how to purchase things from the trader
• Create a new behaviour for the NPC trader to "retrieve" the item
• Seek closest table to the person who's purchasing the item and place item on the table after being retrieved.
• Teach fenny what the vars mean in the map editor :3