Create a correlation heatmap for the pgRNA CPMs

This function uses the `cor` function to find correlations between the sample CPM's and then plots a heatmap of these

qc_cor_heatmap(gimap_dataset)

Arguments

gimap_dataset: The special gimap_dataset from the `setup_data` function which contains the transformed data

`sample_cor_heatmap` a pheatmap

if (FALSE) { # \dontrun{
gimap_dataset <- get_example_data("gimap")
qc_cor_heatmap(gimap_dataset)
} # }