Guard Villagers (Fabric) Fork

Bumps to minecraft version 1.21.9 from the previous snapshot release. Updates armor rendering (as done to all previous version) that didn't match the original version of this repo from mrsterner.

Updates to shoulder pads:

• no longer show through chest armor
• slightly rotated downward to match original version

Updates to quiver:

• updated quivers to match the slight offset on the back as found in the original version
• no longer intrudes into the head.
• now sit off of chest armor slightly more to prevent armor rendering into the quiver.
• size was slightly reduced.
• only renders if not holding a bow or a crossbow

Known Issues:

• [NEW] Guards move sporadically/unrealistically when suddenly encountering a hostile mob (i.e. a pillager dropped via summon).
• Bow guards that have an active target have a tendency to take paths that incur fall damage when no other path is available.
• Melee guards with shields can get stuck in a permanent blocking-only loop when 1v1 against a ranged mob.

Migrating from <=1.21.5: you will see warnings in the logs like Failed to decode value '{}' from field 'ArmorItems' at index 0': No key id in MapLike[{}]. This is due to inventory management changes and is expected. May fix in the future.