ANSI Escape Codes

[WeiqunZhang]

Add commonly used ANSI escape codes to AMReX_ANSIEscCode.H. They can be
used to print colored output. For example,

amrex::Print() << Font::Bold << FGColor::Red << "Hello world from AMReX\n"
               << ResetDisplay << Font::Faint << FGColor::BrightCyan
               << Font::Underline << "Hello world again from AMReX "
               << ResetDisplay << BGColor::White << FGColor::Black << amrex::Version()
               << ResetDisplay << std::endl;

Summary

Additional background

Checklist

The proposed changes:

• fix a bug or incorrect behavior in AMReX
• add new capabilities to AMReX
• changes answers in the test suite to more than roundoff level
• are likely to significantly affect the results of downstream AMReX users
• include documentation in the code and/or rst files, if appropriate

[cgilet]

Question @WeiqunZhang : what happens if I don't do the intermediate ResetDisplay and, say, just try to change the font color with FGColor::BrightCyan?

[zingale]

it will persist with that color setting until you change it next. So if you want to do a block of output in a color, you can change it once, do all of the std::cout, and then reset.