v1.6.0

• Improve limb rig
  • Better IK stretching
    • Stretch 0.0 no longer makes any scaling literaly
  • To be able to blend IK result between Pole Mode 0.0 - 1.0
  • To be able to snap IK Pole Vector to FK
• Fix some bugs
  • Fix Unity Mechanim rig's wrong 'FK Limb Follow' behaviour