Improved the buy more menu. In the past, buying and sellling were done using the same button in buy more menu, and players may have accidentally purchased so many items due to incorrect left clicking (because left click is buy, right click is sell by default). Now this issue has been resolved.
The buy more menu now distinguishes between purchase confirmation items and sellling confirmation items, as you can see examples on the wiki.
Technically speaking, UltimateShop now uses BigDecimal instead of the previous double type data to calculate the price of products. For decimal calculations, UltimateShop's current calculations will be more accurate.
GUI Editor now supports edit the items included in the product, and also create new items for products.
GUI Editor now supports delete the items and the display item included in the product.
Fixed MMOItems item always being parse item ID to "" in GUI Editor.