Model update checklist

[zsunberg]

To update a (PO)MDP model to POMDPs 0.9, the following changes should be made:

• In Project.toml, update [compat] for POMDPs to include 0.9
• If gen(DDNNode, ...) is implemented, replace it with transition/observation and POMDPModelTools.ImplicitDistribution.
• Move initialstate_distribution to initialstate
• If initialstate(m, rng) is implemented, replace it with initialstate(m) and ImplicitDistribution
• If initialobs(m, s, rng) is implemented, replace it with initialobs(m) and ImplicitDistribution
• If observation(m, sp) is implemented, implement initialobs(m, s) accordingly

Packages that need updating

• [x] QuickPOMDPs

[zsunberg]

This seems to be done