ReadingOrderDetector and tidying DLA project

[BobLd]

• Tidying the UglyToad.PdfPig.DocumentLayoutAnalysis project by creating folders
• Adding TextBlock.ReadingOrder
• Adding IReadingOrderDetector to gets the blocks in reading order and sets the TextBlock.ReadingOrder
• Adding DefaultReadingOrderDetector that does nothing
• Adding RenderingReadingOrderDetector that retrieve the blocks' reading order using rendering order (TextSequence) as suggested in Adding TextSequence number to each letter to determine if letters belong to the same Tj operation #61
• Adding UnsupervisedReadingOrderDetector that retrieve the blocks' reading order using both (spatial) Allen’s interval relations and rendering order (TextSequence). References:
  • Section 5.1 of 'Unsupervised document structure analysis of digital scientific articles' by S. Klampfl, M. Granitzer, K. Jack, R. Kern
  • 'Document Understanding for a Broad Class of Documents' by L. Todoran, M. Worring, M. Aiello and C. Monz.

[codecov-io]

Codecov Report

Merging #123 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #123   +/-   ##
=======================================
  Coverage   72.18%   72.18%           
=======================================
  Files         449      449           
  Lines       26849    26849           
=======================================
  Hits        19381    19381           
  Misses       7468     7468

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