FPDF.bezier() to render quadratic and cubic Bézier curves, and many improvements

Note: a temporary 2.8.0 version was released but then erroneously removed on Pypi.
Versions 2.8.0 & 2.8.1 are exactly the same.

Added

• support for quadratic and cubic Bézier curves with FPDF.bezier() - thanks to @awmc000
• support for escape character for markers in markdown text issue #1215
• Wrapping words on spaces now considers all common space symbols in addition to regular spaces (' '), addressing issues with word-wrapping for languages like Thai, as per #1190 and #1191.
• Templates can now be also defined in JSON files.
• support to optionally set wrapmode in templates (default "WORD" can optionally be set to "CHAR" to support wrapping on characters for scripts like Chinese or Japanese) - cf. #1159 - thanks to @carlhiggs
• documentation on how to use fpdf2 with Rough.js: link to docs
• documentation on how to use fpdf2 with gunicorn: link to docs
• new translation of the tutorial in Türkçe, thanks to @Natgho: Türkçe
• feature to identify the Unicode script of the input text and break it into fragments when different scripts are used, improving text shaping results
• FPDF.image(): now handles keep_aspect_ratio in combination with an enum value provided to x
• FPDF.write_html(): now supports CSS page breaks properties : documentation
• FPDF.write_html(): new optional font_family parameter to set the default font family
• FPDF.write_html(): spacing before lists can now be adjusted via the tag_styles attribute - thanks to @lcgeneralprojects
• file names are mentioned in errors when fpdf2 fails to parse a SVG image

Fixed

• FPDF.local_context() used to leak styling during page breaks, when rendering footer() & header() - MR: #1207
• fpdf.drawing.DeviceCMYK objects can now be passed to FPDF.set_draw_color(), FPDF.set_fill_color() and FPDF.set_text_color() without raising a ValueError: documentation.
• FPDF.write_html(): fixing rendering of <hr> tags, that do not trigger a page break anymore
• FPDF.write_html(): fixed automatic page break when an image does not have enough vertical space to be rendered on a page
• individual /Resources directories are now properly created for each document page. This change ensures better compliance with the PDF specification but results in a slight increase in the size of PDF documents. You can still use the old behavior by setting FPDF().single_resources_object = True
• line size calculation for fragments when text shaping is used
• FPDF.write_html(): fixed incoherent indentation of long <ul> list entries - cf. issue #1073 - thanks to @lcgeneralprojects
• default values for top_margin and bottom_margin in HTML2FPDF._new_paragraph() calls are now correctly converted into chosen document units.
• In text_columns(), paragraph top/bottom margins didn't correctly trigger column breaks; issue #1214
• fpdf.drawing.color_from_hex_string did not test or mention accepting lowercase hex values.
• handling of bidirectional text on FPDF.get_string_width() [issue #1231]
• new translation of the tutorial in Indonesian - thanks to @odhyp
• RecursionError in some cases when calling FPDF.write_html() inside FPDF.footer() - issue #1222

Removed

• support for Python 3.7, that reached end-of-life in 2023
• an obscure and undocumented feature of FPDF.write_html(), which used to magically pass instance attributes as arguments.

Deprecated

• fpdf.TitleStyle has been renamed into fpdf.TextStyle
• FPDF.write_html(): tag_indents introduced in the last version - Now the indentation can be provided through the tag_styles parameter, using the .l_margin of TextStyle instances

Changed

• FPDF.local_context() used to treat font_size as a value in points. Now this is the role of font_size_pt, whereas font_size allows to set the font size into chosen document units (specified with FPDF(unit=)) - MR: #1207
• FPDF.circle() : the previous r parameter, that in fact defined the diameter, has been replaced by a new radius paremeter. The x & y parameters now define the circle center, instead of its top-left corner as it used to be - issue #1245
• FPDF.table() now raises an error when a single row is too high to be rendered on a single page
• FPDF.write_html(): indentation of HTML elements can now be non-integer (float), and is now independent of font size and bullet strings.
• improved performance of font glyph selection by using functools cache
• Clarified usage of the style attribute in FPDF.add_font()