gam_working_ind: Get indices of parameters in working vector
In simonecollier/lizardHMM: Fitting Lizard Movement Data with HMMs

This function finds the indices for each parameter of the gamma HMM within the vector of working parameters outputted by gam_working_params().

gam_working_ind(
  num_states,
  num_variables,
  num_subjects,
  num_covariates,
  state_dep_dist_pooled = FALSE
)

`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.
`num_covariates`	The number of covariates in the data that the transition probability matrix depends on.
`state_dep_dist_pooled`	A logical variable indiacting whether the state dependent distribution parameters `mu` and `sigma` should be treated as equal for all subjects.