Allow customising colours

[savchenko]

Is your feature request related to a problem? Please describe.
I'm always frustrated when Bandit shows bright yellow text on white background.

Describe the solution you'd like
Allow customising colours OR configuration for black-on-white terminals.

Describe alternatives you've considered
bandit -f txt

Additional context

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[lukehinds]

Sounds good, would you be up for working on this @savchenko ?

[savchenko]

@lukehinds, acta non verba: #1276

[daniel-mohr]

Maybe a (bad) workaround:

bandit -r . | cat

At least it is now also legible on a white background.

[ericwb]

@daniel-mohr Piping to cat is equivalent to using the -f txt output option.