Release 1.6 - Support AnyLogic 8.7.4 and Ray 1.3

What's Changed

• enable freezing with Webapp by @kepricon in #272
• fix ecr issue by @xneyder in #280
• write complete report after freezing by @kepricon in #282
• Pathmind Helper small bug fixes by @ejunprung in #275
• Python simulations (obs selection, reward functions etc.) by @maxpumperla in #276
• dev-286 fix AL env creation by @kepricon in #287
• update AL base env for 8.7.3 by @kepricon in #291
• modify for mc rollout by @kepricon in #290
• Corrected order of execution of code in step by @SaharEs in #288
• dev-302 support multi agent for freezing by @kepricon in #303
• Do not trigger actions when all agents skipped by @ejunprung in #306
• cut pathmind api by @maxpumperla in #297
• support freezing is false by @kepricon in #307
• support AL 8.7.4 by @kepricon in #305
• Update stopper for Ray 1.3 by @ejunprung in #310

Full Changelog: v1.5.0...v1.6.0