Issue #315: New tool Elliptic Arc (dismine/valentina)

New issue 315: New tool Elliptic Arc https://bitbucket.org/valentinateam/valentina/issue/315/new-tool-elliptic-arc

Roman Telezhinskyi:

Create new tools:

  • Elliptic arc (start and finish angle)
  • Elliptic arc (start angle and length)
  • Tool for separate elliptic arc by length.

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