VBD Solver v1.4

• Add dual solving (AVBD)
  Note this currently only affects the new AVBD constraints below.
• Add AVBD Spring constraints
• Add AVBD Spring to VBD Constraints node
• Add AVBD Joint constraints
• Add AVBD Joint to VBD Constraints node
• Add hard constraint option for AVBD constraints (infinite stiffness)
• Add constraint breaking
• Add support for custom forces (same as Vellum)
• Steal Vellum's logic for when graph coloring gets triggered