Support ANSI escape sequence normalization

Some problems are color-sensitive, and there are infinity possible ways to render the same thing in the terminal with ANSI escapse sequence. We need to do normalization before automated the evaluation on them.

No files or tests are named. Start by locating the automated evaluation path and the comparison of terminal output; determine where ANSI escape-sequence normalization belongs before evaluation. Done means equivalent ANSI renderings are normalized so color-sensitive problems can be evaluated consistently.

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