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Display error type (error, warning, script error) in OS::print_error + cleanup error ANSI coloring

Created by: akien-mga

tl;dr: In the end, it looks like this:

  • Dark background colour: gt-colour1
  • Light background colour: gt-colour2

Previously all types of errors would be shown as ERROR, thus making for example warnings (WARN_PRINT) somewhat aggressive.

Fixes #1127 (closed).

Note that I'm a beginner C++ developer, so the coding logic I adopted might not be the best one. I also only tested the changes on Unix/X11, so the changes for Windows and WinRT need to be thoroughly reviewed (though they're more or less copy-pastes of the Unix code).

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