v0.1.4

• Improved path search solution rendering in gridworlds
• Support animation of planning algorithms via anim_solve! and anim_refine!.
• Implemented gridworld animations for RTDP, RTHS, and ForwardPlanner.
• Support appending frames to an existing animation.
• Support multi-agent policy rendering for gridworlds.

Full Changelog: v0.1.3...v0.1.4