replace external dependecy `xterm-color` with Emacs core (built-in) `ansi-color`

[ed9w2in6]

Hmm I had took a look lately with ripgrep and it seems that this package only uses xterm-color for xterm-color-filter, correct me if I am wrong.

If I am right about this, I believe they can be replaced with the builtin ansi-color-apply.

This can reduce external dependencies and make configuration simpler. related: #401