Add Vector Guided Drawing Auto-Inbetween option (#2931)
    
    * Add Vector Guided Drawing Auto-Inbetween option

    

    * Enable Guided Drawing for Front Onion Skins

    

    * Allow forward Guided Inbetweening

    

    * Add Select Guide Stroke commands

    

    * Add Tween Guide Strokes commands

    

    * Add additional guide stroke selection optins

    

    * Fix break setting issues with guided tweening

    

    * Enable Guided Tweening for Geometric Tool

    

    * Remove unnecessary tool switching for tweening

    

    * Fix closest tweening using wrong strokes

    

    * Disable Guided Tweening when onionskin is disabled