Add Cape Angle Clamp tweak

[RuiXuqi]

Improves visuals by limiting player cape rotation, matching modern Minecraft behavior.

Not tested yet in Universal Tweaks because the build script is broken, but I verified the mixin class separately in a small test mod and confirmed it works in both development and production environments.

[what-the-diff]

PR Summary

• Updated Project Documentation
  Improved the README.md document to include a description and instructions for a new feature: Cape Angle Clamp. This new feature helps control the rotation of the player's cape, particularly when moving at high speeds.

• New Setting for Cape Angle Clamp Feature
  Contributed a new boolean configuration setting utCapeAngleClamp within UTConfigTweaks.java. This allows users to enable or disable the recently introduced Cape Angle Clamp feature.

• Enhanced Game Loading with New Feature Integration
  Made adjustments to UTLoadingPlugin.java to incorporate the new feature based on the user's configuration settings. This ensures smooth integration of the Cape Angle Clamp feature upon game loading.

• Implementation of Cape Angle Clamping
  Introduced a dedicated mixin class UTCapeAngleClampMixin.java that contains the necessary implementation for the Cape Angle Clamp feature. This facilitates smooth and controlled rotation of the player's cape during gameplay.

• Registered New Mixin for Cape Behavior
  Established a fresh mixin configuration file mixins.entities.cape.json to register the new mixin related to cape behavior. This allows the game system to identify and appropriately manage the new cape behavior modifications.