Font colors in error messages are bad in some terminals about chispa HOT 1 OPEN

Determining default terminal colours is difficult and impossible in some cases. We could try to guess, but for the sake of simplicity it might be easier to do the following:

• Change white to a colour that works with most common background colours by default (green?)
• Add option to change colour scheme of the table, an optional dict perhaps e.g.:

colour_scheme = {
   default:'red',
   matched:'blue',
   underlined:'green'    
}
assert_df_equality(df1, df2, underline_cells=True, colour_scheme=colour_scheme)

We would need to add a validation step for the colour scheme dict.

from chispa.