Create an AnsiTemplater class, to add ANSI markup to input

[dimo414]

Original report by Michael Diamond (Bitbucket: dimo414).

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E.g. colorize ERROR/WARNING log lines.

[dimo414]

Original comment by Michael Diamond (Bitbucket: dimo414).

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Potential syntax:

AnsiTemplater template = AnsiTemplater.builder()
  // Color lines containing "ERROR" red
  .addTemplate().color(RED).pattern(".*ERROR.*")
  // Color the word OK green when surrounded by square brackets (like [ OK ] service messages)
  .addTemplate().string("[ ").color(GREEN).string("OK").string(" ]")
  // highlight the word foo wherever it appears
  .addTemplate().color(YELLOW, BOLD).caseInsensitiveString("foo")
  .build();

template.process(System.in).toOut();
template.process(Paths.get(filename)).toErr();