A list containing all elements of predator_params. For
PREDEDEQ 1, an ED_data numeric vector of length
n_days + 1 is added (or validated if already present). For
PREDEDEQ 2 and 3 the list is returned after validation with no
additional derived values.
Arguments
predator_params
Raw predator parameters
n_days
Integer. Number of simulation days, used to build the
energy density vector from `ED_ini`/`ED_end` when PREDEDEQ = 1.
If `NULL` the vector is built lazily when the simulation starts.