Allow to use ANSI 4 bit colors

[catap]

Description

Here some changes which I made when works on #5342 , I think we may say that it actually fixes #5342 because after that we have full colors in docs and code which allows user to do colours as he would like to.

To Do

• Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• Tests. (Very much encouraged but not strictly required.)

Not sure that it can be tested or worh to point in changelog.

[github-actions]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[snejus]

Looks good. Would you mind adding a note in the changelog?

[catap]

@snejus here it is.