Cinemachine Package v1.3.1

Added support and example for cinemachine.

see the live demo at https://nickmaltbie.com/OpenKCC/Cinemachine

OpenKCC

• Adjusted how stairs and snap down are handled in KCCMovementEngine
  and KCCUtils to make player slowly move up or down stairs based on
  the remaining movement speed of the player.
• Adjusted KCCMovementEngine to have a max speed for snapping down
  to stop the player from teleporting down harshly and making player camera
  jitter.
• Added IOnPlayerTeleport to listen to teleport events from
  the KCCMovementEngine and respond accordingly.

OpenKCC.inemachine

• Added basic SmoothAvatarPos to smooth avatar position based on some damping
  factor to smooth out any jittery movements of the player when snapping
  up or down surfaces.
• Added basic test scene and scripts for different camera perspectives including:
  • Over the shoulder camera
  • Third person re-centering camera
  • First person camera
• Initial setup of cinemachine project.