Update 2021-04-24

Major updates:

• Added merchant NPCs and gold currency. 
• Merchants NPCs: blacksmith (sells 3rd Legion armor), alchemist (sells plants for potions making), innkeeper (sells potions and ability scrolls)
• Reworked chests functionality - same UI as for merchants, so now chests may contain several different items.
• Added visuals for equiped belt items, wich may serve as indication for amounts of items and reflect slot cooldowns.
• Added cooldowns for belt slots with ability to assign the same item to several slots to compensate this cooldown.
• Added rewards for quests - gold and/or items.
• Improved ability system: ability points gained from scrolls, functionality for drag-and-drop ability assignment to any slot with hotkey.