Support for page labels & Python 3.13 - various fixes & improvements

Added

• new optional parameter border for table cells: users can define specific borders (left, right, top, bottom) for individual cells - thanks to @Kaustbh - issue #1192
• FPDF.write_html(): now parses <title> tags to set the document title. By default, it is added as PDF metadata, but not rendered in the document body. However, this can be enabled by passing render_title_tag=True to FPDF.write_html().
• support for LZWDecode compression - thanks to @opposss - issue #1271
• Python 3.13 is now officially supported
• support for page labels and created a reference table of contents implementation - thanks to @andersonhc - PR #1188
• documentation on how to: render spreadsheets as PDF tables
• support for passing Align values (along with string values like 'C', 'L', 'R') in l_margin of TextStyle to horizontally align text - issue #1282

Fixed

• support for align= in FPDF.table(). Due to this correction, tables are now properly horizontally aligned on the page by default. This was always specified in the documentation, but was not in effect until now. You can revert to have left-aligned tables by passing align="LEFT" to FPDF.table().
• FPDF.set_text_shaping(False) was broken since version 2.7.8 and is now working properly - issue #1287
• fixed bug where cells with rowspan, colspan > 1 and null text were not displayed properly - issue #1293
• CreationDate metadata used a wrong timezone offset for UTC - issue #1261
• insert_toc_placeholder() did not properly the page orientation, which caused a bug when the last page of the document was in a different orientation - issue #1213

Changed

• improved logic for handling text substitution of the total number of pages, ensuring compatibility with text shaping - issue #1090
• all AnnotationDict properties can now be passed to FPDF.text_annotation(), FPDF.free_text_annotation(), FPDF.add_action(), FPDF.add_text_markup_annotation() & FPDF.ink_annotation(). This includes title, color, border_width...

Removed

• reminder : since release 2.8.1, fpdf2 does not support Python 3.7, that reached end-of-life in 2023