1.20.1 - 20.1.52:

• All bone names are now lowercased to allow ignoring the uppercase names.
• Added AnimationSystem.Builder.geometry() to set the default geometry used for positional model calculations;
• AnimationLayer.Builder.initialAnimation, enabling animations to be played out-of-the-box when animation system is being created;
• DefaultsHA.HEAD_LOOK and AnimationSystem.Builder.addHeadLookLayer, allowing the head look to be handled by HammerAnimations if your head bone is named "head";
• Changed "root" model name to "model_root", since people may use "root" as a bone name and be surprised things suddenly stop working;