#292 Update raildiagram generator documentation and diagrams.

Merged Albert Hofkamp requested to merge 292-railroad-diagram-generator-improvements into develop
  • New documentation about debug approach and available tools
  • New documentation about Command-line
  • Adapted property file documentation to using integer values
  • Reworked some details in the example section, mostly splitting the meta-terminals from terminals to limit the amount of text of the latter
  • Index gives more guidance what to expect in a section

Closes #292 (closed)

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