EasyChestShop

-added icons on the gui

-Correctness fixes
processBuy / processSell are no longer async without await
ShopManager.isOwner is now a real static class method
sell price now enforces a minimum of 1
sell tax is now applied symmetrically
Economy.add(..., 0) no longer creates junk scoreboard entries
hologram orphan cleanup is now implemented
container validation now uses strict type matching
fixed invalid JSON comments in RP/entity/text_entity.json

New features
Buy Custom amount
Pause / Resume Shop in settings
Low-stock threshold in create/update UI
Buyer receipt viewer via /cs:receipt
Price history viewer
Tag filtering in the shop directory
Sell All confirmation for large sales
Starting balance support for first-time players
Ownership transfer to another online player
Affordability confirmation before buy actions
Last-known stock shown in directory for unloaded shops
expanded Settings menu

Performance / maintenance
hologram entity caching
world property index for shops
notification queue now uses system.currentTick
per-player shop limit support