Add support for EconomyShopGUI

[titidelaff]

Description of Feature

Create two task type: [economyshopgui_buy] economyshopgui_sell]

Reason for Addition

Need to migrate from shopgui+ to EconomyShopGUI and conserve quests

Alternative Solutions

none

Agreements

• [X] I am running the latest version of Quests
• [X] I am certain this request is unique and a similar issue is not currently open

Other

No response