create_ave_plot_data: create_ave_plot_data
In gm209/gmtools: A collection of generic ML functions for Insurance Risk Modelling

This function creates a data.table containing average actual & fitted performance over a specified dimension

1	create_ave_plot_data(x, y_true, y_pred = NULL, w = NULL, rescale = FALSE)

`x`	A vector that contains the dimension that you want to aggregate by
`y_true`	A vector that contains the target variable (think OBS in emblem)
`y_pred`	A vector that contains the fitted value from a model (think CA in emblem). Defaults to NULL
`w`	A vector that contains row level weights (e.g. exposure). Defaults to NULL
`rescale`	A logical indicating whether you want to the resulting series scaled about the largest level