Fixes, performance improvements

Fixed #651
Fixed #645
Fixed #622
Fixed #653
Fixed #640
Added methods and atrributes to speed up TOC maintenance.
Added new page method to extract text from inside a rectangle.
All getText() methods (except (X)HTML and XML) now support a clip parameter.

Bug fixes and more support for font replacements

• Fixed #605
• Fixed #600
• Added origin key to text span dictionary of Page.getText("dict").
• Added property buffer to fitz.Font.
• Added option sanitize to Page.cleanContents().

Several fixes

• Fixes #561
• Fixes #566
• Fixes #568
• Correct use of opacity default in TextWriter.writeText().
• Supporting fonts of [pymupdf-fonts(https://github.com/pymupdf/pymupdf-fonts).
• Some smaller feature improvements.

Font Handling improvements and other fixes

Fixes #561 - more than 10 TextWriter fonts per page
Fixes #562 - annotation pixmaps no longer derived from tha page
Fixes wrong appearance of mono-spaced fonts
Resolves #563 - allow manipulation of PDF property NeedAppearances
Support optional fonts provided via repository pymupdf-fonts

Minor Fixes, more flexible TextWriter Textbox

Fixes #540
Fixes #548
TextWriter.fillTextbox now supports indenting start of text.

Fix Important issue

Fixes #533
Adds appearance flexibility to redactions annotations, #535.

Addressing minor bugs

Fixed: #525, #520
Implemented: #524

Improved interactive help a lot.

Supporting MuPDF v1.17

• Improved Redaction annotation support.
• Fixing #508, #503, #502, #500, #496
• Minor feature enhancements

New classes: Font and TextWriter

This introduces two new classes (Font and TextWriter) for better support of MuPDF's text writing features for PDF files.
In addition, issues #488 and #493 are fixed.

Note:
This should be the last version based on MuPDF v1.16. Artifex has just published (April 21) a release candidate for a new version 1.7.

Minor fixes, more accurate dpi information

resolves #479