Get all names from a model object

## Usage

```
# S4 method for mrgmod
names(x)
```

## Examples

```
mod <- mrgsolve::house()
names(mod)
#> $param
#> [1] "CL" "VC" "KA" "F1" "D1" "WT" "SEX" "WTCL" "WTVC"
#> [10] "SEXCL" "SEXVC" "KIN" "KOUT" "IC50"
#>
#> $init
#> [1] "GUT" "CENT" "RESP"
#>
#> $capture
#> [1] "DV" "CP"
#>
#> $omega
#> [1] "..."
#>
#> $sigma
#> [1] "..."
#>
#> $omega_labels
#> $omega_labels[[1]]
#> [1] "ECL" "EVC" "EKA" "EKOUT"
#>
#>
#> $sigma_labels
#> $sigma_labels[[1]]
#> [1] "EXPO"
#>
#>
```