om_mix_models: Run mixed effects model
In openmindplatform/openmindR:

This function performs mixed models (Currently only works on Ann Miller experimental data)

om_mix_models(
  gathered_dat,
  question,
  plot_model = F,
  get_effects = F,
  get_tidy = F
)

`gathered_dat`	Assessment data as long format
`question`	Specify question that you want to perform analysis for (ex: `"Q18"`)
`plot_model`	logical. Show a coefficient plot of the model. Default is `FALSE`
`get_effects`	logical. Get marginal effects. Default is `FALSE`
`get_tidy`	logical. Get a tidy dataframe with estimates. Also calculates pseudo cohen's d efecct sizes. Default is `FALSE`