UltimateMobCoins

Changes:

• Added redeem command to redeem all mobcoins in the player inventory (/mobcoins redeem)
• Added new settings regarding drops and redeeming mobcoins. Improved compatibility with older configuration files.
• Allow merging of mobcoins by dragging a mobcoin onto another mobcoin in a inventory.
• Properly format the placeholder on a mobcoin item.
• Log when a shop is refreshed.
• Fixed NPE in the update checker when modrinth is unavailable.
• Removed some duplicated code.