Better BushyLeaves (Automatic Port)

handling for the Euler {x,y,z} rotation dialect, mapping it to Bedrock bone rotation [-x,-y,z] to match the mirrored-X coordinate transform same sign convention used by the existing single-axis path. Origin/pivot parsing is shared between both dialects

1. the element rotation parser only understood the vanilla single-axis {"angle","axis"} form. Newer 1.21+ block models use the Blockbench free/Euler {"x","y","z"} form, so their tilt was lost and stacked leaf layers collapsed into coincident boxes — causing z-fighting flicker and self-shadowing dark patches
   
   updated the images aswell