GLTF Animation + 2D SDF Nodes

• Breaking Changes
  • gltf.PolyformScene.Models changed from []PolyformModel to []*PolyformModel
  • gltf.PolyformModel.Children changed from []PolyformModel to []*PolyformModel
• Features
  • Nodes can now have port types that are pointers
  • Front end now auto plays animations
• New Nodes
  • drawing/coloring
    • Red
    • Green
    • Blue
    • Cyan
    • Magenta
    • Yellow
    • Black
    • White
  • drawing/texturing
    • FromImage
    • SelectColor
    • MaskToSDF
    • SampleSDF
  • formats/gltf
    • Animation
    • TranslationAnimationChannel
    • RotationAnimationChannel
    • ScaleAnimationChannel
  • math/sdf
    • CutSphere
    • Torus
  • math/sequence
    • Linear
  • modeling/animation
    • UniformFrames
• Bug Fixes
  • Image Deserialization from profiles
  • Line SDFs can now have same start and end point
  • Extrude Circle can now be closed
  • Tons of reflection fixes, specifically around pointers
  • Can delete and rename graph variables