Nearley: unicode support, verbatim env and pretty print error msg

[zmx0142857]

• fix: unicode emoji compatibility problem
• fix: escape backslashes in text "\\"
• feat: verbatim environment verb"..."

• feat: pretty print of error message: try to type this single character in am: /, check this pretty-aligned error output:

  Error: Syntax error at line 1 col 1:
  
  1  /
   ^
  Unexpected opAOB token: "/"

  For more examples, please refer to nearley/README.md and the test suite.

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