[Custom Arrows] 1.20.4 Refactor

• Updgraded to 1.20.4 and majorly refactored the whole pack.
• Switched from namespace namespace to custom_arrows.
• All new arrow types are now data driven and customiseable.
• Uses macros extensively, so no longer compatible with 1.20.1 and prior.
• Picking up an arrow now has a short animation.