Player Vendor AI

[DragonSlayer62]

• [ADD] Extended Player Vendor AI functionality through new js/npc/ai/playervendor.js script
• [ADD] Added new vendorGoldHeld character property to track gold earned from player vendor sales separately from deposited vendor funds.
• [ADD] Added Character JS property .vendorGoldHeld to track gold earned from player vendor sales separately from deposited vendor funds
• [ADD] Added support for player vendor bank accounts, gold collection, gold deposits, and bank flush operations.
• [ADD] Added automatic upkeep calculations with configurable charge periods and item-based fees.
• [ADD] Added support for player vendors returning items, gold, and deeds to owners when dismissed or removed due to lack of funds.
• [ADD] Added player vendor appearance customization, clothing customization, and vendor renaming options.