Release 2.4.0

[Argmaster]

• Added command line interface utilizing API V2 for rendering Gerber files to images.
  This includes interface for rendering PNG, JPEG and SVG images and multi-file projects
  to single PNG/JPEG image.
• Added support for inferring file type from file extension or .FileFunction file
  attribute. This mechanism is used by default by API V2 based command line interface.
• Refactored test suite and dropped testing of code related to Parser class originally
  included in PyGerber 2.0.0. Currently only Parser2 related code is actively
  tested.

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This discussion was created from the release Release 2.4.0.