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* Added text bounding box extraction. * Add `font` field to textMark struct; Create a new method `TextComponents` to retrieve all the text components of the extracted text in the page, with position and character informations * Reorganizing extractor/text.go * Added a text extraction position test. * Added another text extraction location test. * Text extraction location testing. * Added tests for text extraction with location information. * Cleaned up text extraction tests. No changes to functionality. * Simplifying text extraction code. * Simplified line construction in text.go * Returning TextMark's in TextMarkArray which are based on PdfObjectArray but read-only, so not pointers. * Added text extraction to show PDFs marked-up with bounding boxes of substring in extracted text. * Add comments explaining how to calculate text bounding boxes. * Made text_test.go naming consistent with function comments in text.go * Use tm, pt, tl for textMark/TextMark PageText and TextLine receivers and local variables. * uncommeted text stress test. Use go test --short to skip * TextMark.Offset is now an index into the extracted text. It was an index into []rune(text)