Support box-sizing, and min-/max- widths and heights on blocks, tables and cells #593

Part of #552 (step 28, missing support, high priority).

Three sizing properties that framework CSS relies on are not read:

• box-sizing is never read.
• min-height and max-height are not read on blocks.
• min-width, max-width, min-height and max-height are not read on tables and cells.

Bootstrap, Tailwind and most resets start with *, ::before, ::after { box-sizing: border-box }, so every padded box with a width comes out wider than designed.

min-width and max-width on blocks are #588. height acting as a minimum today is #587.

Measured on gravitypdf at 60b82630, PHP 8.5.4, from the filled rectangles.

Where the values are read today.

• Blocks: WIDTH in setCSS() (src/Mpdf.php:19356-19359) and HEIGHT in BlockTag::open() (src/Tag/BlockTag.php:558). The css_set_width they set is the content width, and BlockTag::open() adds padding and borders to it (:830-875).
• Tables: WIDTH in Table::open() (src/Tag/Table.php:159-163), then _tableWidth() (src/Mpdf.php:21023) and _tableColumnWidth() (:20547) share the width out between columns.
• Cells: WIDTH and HEIGHT in Td::open() (src/Tag/Td.php:376-394).
• Images: min-/max- are read, and nothing else is (src/Tag/Img.php:138-141).

Fix.

• box-sizing. Read it in BlockTag::open(), Table::open() and Td::open(). With border-box, take padding and borders off width, height and the min-/max- values before storing them, and never go below 0. It is not inherited, so a * rule reaches each element through the cascade; Match the universal selector * #530 makes * match.
• min-height and max-height on blocks. Needs height to be exact first (A percentage height on a block resolves against the page area, and height acts as a minimum that overflow: hidden does not clip #587). Then min-height pads the box out, as height does today, and max-height caps it, with the rest overflowing.
• Tables. Clamp the table's width in _tableWidth() after the content has been measured.
• Cells.
  • min-width raises the column's minimum.
  • max-width caps its maximum in _tableColumnWidth(), as the w a cell's width sets does.
  • min-height pads the row as height does on a cell.
  • max-height on a cell is undefined in CSS 2.1; leave it.
• Percentages resolve as width and height do on the same element.

Tests. Each row above; box-sizing: content-box restoring the default; border-box with percentage widths, with auto margins, and on a float; min-width larger than max-width (min wins); and a cell's min-width in a table-layout: auto table with colspan.