gam0_working_params: Transform gamma HMM parameters from natural to working
In simonecollier/lizardHMM: Fitting Lizard Movement Data with HMMs

The function transforms the natural gamma HMM parameters that have additional constraints into working parameters that incorporate the constraints. Zero inflated gamma funciton.

gam0_working_params(
  num_states,
  num_variables,
  num_subjects,
  alpha,
  theta,
  zweight,
  beta,
  delta
)

`num_states`	The number of states in the desired HMM.
`num_variables`	The number of variables in the data.
`num_subjects`	The number of subjects/trials that generated the data.
`alpha`	A list of matrices containing the shape parameters of the state dependent gamma distributions. Each matrix corresponds to a different variable, each row corresponds to a different subject and each column corresponds to a different state.
`theta`	A list of matrices containing the scale parameters of the state dependent gamma distributions. Each matrix corresponds to a different variable, each row corresponds to a different subject and each column corresponds to a different state.
`zweight`	A list of vectors, one for each variable, containing the weights for the zero inflated gamma distribution.
`beta`	A matrix of regression coefficients for the effect of the covariates on the transition probability matrix `gamma`.
`delta`	A list of the initial state distributions for each subject.