refactored some lexer configurations to make them more pleasurable to look at

* color.target is yellow in terminal.tes which looks awful and it should be
  used sparingly.
  The largest part of text in any lexer should be in the default colors.
* bash.tes now discerns between double and single quote strings like most lexers.
* autodetect GNUmakefiles
* yaml.tes now uses color.string for keys - this is for consistency with JSON
  where keys will also always be strings.

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