Fabric Shield Lib

Changes

• Made enchantability of vanilla shield more like other iron items
• Fixed a typo in fabric_banner_shield item model
• Ported 1.3.4 over to 1.16.5!

Changes

• Moved all rendering code to the client.
• Changed RenderMixin to only inject for the client.
• Renamed dev item id's
• fabric_shield_no_banner_support_template is now fabric_shield
• fabric_shield_template is now fabric_banner_shield

Changes

• Split FabricShieldItem into FabricShieldItem & FabricBannerShieldItem
• Made FabricShieldBannerDecoratorRecipe use FabricShield interface instead of FabricShieldItem class
• Fixed incorrect license information in fabric.mod.json

Changes

• Finally added banner support! Special thanks to CringeStar
• Now using Fabric's event system instead of ShieldEvents.
• Custom shields are identified using an interface instead of inheritance.
• Mixins shouldn't conflict with other mods(ex. Requiem)
• Library was rewritten and simplified, less strange behavior should occur.

Should hopefully Fix #22 & Fix #16

Added enchantability to constructors

Reformatted a bunch of code