Fluent Decision Module Classes?

[SeverTopan]

1. Move adjsim.decision.DecisionMutableFloat to adjsim.decision.mutable.Float.
2. Move adjsim.decision.RandomSingleCastDecision to adjsim.decision.random.SingleCast

Same idea for all others.

[SeverTopan]

This is an API breaking change, needs major release.

[SeverTopan]

New design concept:

• decision modules -> decision.module.qlearning.Perturbative, decision.module.random.SingleCast
• decision mutable values -> rename to decision parameterizations: decision.parameterization.Float